I'm predicting Quarians are in ME:A. (Spoilers from the Gameplay Trailer)

Possibly, but why do that if you aren't going to have Geth as well since then that case won't be prevalent and it would have been easier to keep Quarians as they are? Plus I'd say they kind of did that in the Shepard Trilogy, since they had the same basic build, number of fingers, etc. Even the Quarian masks they wear have the mouth part look kind of like a Geth face. 
The head sticks too far out to be Quarian unless they did that redesign you mention, and if you notice the tubes hanging from it they match the placement of the Geth tubes compared to Quarian tubes. Add that to them being taller than those around them, and I think an unfinished Geth(by that I mean it seems some of the characters in that shot have the Color ID mats for later detailing). 

Keeping in mind that the ships leave between ME2 and ME3 don't most of the galaxy including the Quarians still believe the Geth are evil killing machines? I'm not so sure they'd let one on their multi-gazillion dollar expedition when everyone else is going to be asleep for 600 years. That just doesn't make sense to me?

Most of the galaxy, yes. However as seen with the krogan involvement, including the head of the core of engineers being one, the Andromeda Initiative has been more open-minded about involving other races for the project. Mac Walters said Bioware had in mind ways for every species we know from the Milky Way being involved in the project thus showing up in Andromeda, even if they may not show up in the first game. So perhaps the Andromeda Initiative made an arrangement with some Geth who extended themselves to the project, like how they sent Legion to extend themselves to Shepard. This gives the Andromeda Initiative more expertise and possibly even a crew for the 600 year journey while the organics sleep, and the Geth who know about the Reapers now have enabled a contingency where their species survives even if the Old Machines win. After all the leaders of the Andromeda Initiative are implied by Bioware to know of the Reapers(may be why they launch the Nexus before it is finished) so would buy the Geth's story and offer. That's just one idea and fits in the lore, more than a lot of things being pushed at least.

The krogan aren't near the level of the geth. You can see krogan working legit jobs before the reaper war and aren't considered hostiles universally. The geth are. It was a massive stretch that Shepard was even able to bring one aboard the Citadel. A more sensible outcome would be for alarms to go off and security to destroy on sight.

If there are Geth, there better be Protheans too.

Well I want there to be quarians more than anything so perhaps that's influencing me but it does look like a Quarian to me. Male, probably.

You know they are....

So, now your argument hinges on "they might be screwed no matter what"? That's not helping your argument. The rest of the galaxy has even less reason to compromise than the quarians. The geth were galactic enemy #1 very, very recently. Whether or not the quarians would hear their pleas for peace is irrelevant. The point is that they'd have made them, and we'd have known it.

Legion made a huge production of showing Shepard the entire history of geth interactions with organics. Shepard's peaceful interaction with Legion was significant because it was the first such example since before the Mourning War. Do we chop down that poignant story and lore, as well, so that we can have geth in Andromeda? Again, we destroy their entire story because we can't let them go?

Before you argue, "None of that necessarily happens in a given playthrough," it can happen, and that's all that matters. BioWare refused to pick a canon ending to the OT out of respect for the myriad "possibilities" in the millions of game saves in the hands of their fans.

The argument that including either/or canonizes a resolution to the war is ridiculous. Including both the quarians and geth must canonize the peaceful resolution, then, right?

The quarians aren't widely beloved or valued, but they aren't a feared, illegal species of AIs. The geth are literally prohibited from existing in Council Space. Quarians can easily be explained in this game. Geth can't. It has nothing to do with canonizing endings. That argument was a serious reach.

BioWare can write whatever they like. It's their story. If they choose to write geth into the story, so be it. I think they'd be better served by waiting for a sequel, before even considering reintroducing the geth. Again, though, it's their story. You run into skepticism at every turn from others here, though, because this idea doesn't make sense. You're always quick to call BS on the smallest issues with this game, and to jump in with great nuggets of lore in other cases, but you're willing to twist common sense and lore into pretzels to include the geth in MEA.

I don't want you to feel like I'm hassling you about it, but you did quote my post and challenge my stance. We should probably keep in mind that this is the "quarian thread", and not the "geth thread", lest we annoy others.

I'm not mocking you, I genuinely want Protheans in ME:A. At least then I would have an excuse to play it. And BioWare has already thrown common sense to the cosmic winds, so the idea that a bunch of Prothean Arks left for Andromeda 50,000 years ago to escape the Reaper threat is not at all farfetched. The prothean galactic civilization were 20,000 years more advanced than the current galactic civilization, so the notion that humanity could journey to Andromeda after 30ish years and the Protheans couldn't after 20,000 years, is, well, bollocks.

I agree. On that note, we should bring along yahg as well because why wouldn't the salarians bring along a viable population of homicidal shadow brokers who could break out of captivity to become a future threat in the Andromeda galaxy?

You got my hopes up revived thread! I thought something had been announced.

I'm still completely unsure if they are in or not. It's difficult because I know that if they aren't in ME:A they are very likely to be in MEA2... and I know that if they were added in a sequel a squadmate would be likely. Part of me thinks it may be best to accept they are probably not in, enjoy Andromeda for what it is and wait until we get a full squadmate in a future game...

But It's already been a five year wait for Andromeda. I'm not patient enough to console myself by thinking about future games.