Are the kett and angara actually the same species?

Yeah they are probably the same race now that someone mentions it.
Archon also had big blue eyes.
Now why would they calcify with hard rock shells is the question ?
The Archon and his posse seems to be some kind of religious group , maybe they go through some strange rituals. And yeah indoctrination and Prothee and Collector and all that.

I really tried but did not spot any similarity despite they both have a face.
Angaran have those very large tentacles/ear on their side the kett do not have, on the gameinformer aarticle revealing the kett it is obvious.
Their eyes look different.

But let's not dump that idea, because their is another weird element : The fiend.
Most of the fiends we saw are with the kett, they have the bone armor, blue skin and the distinct green cloth on their arms.
However in the gameplay trailer first released (2 month ago) we can see another wild one. This one is red and have some fungi stuff on their head, shoulders and back the classic fiend do not have. So it seems obvious that the kett have domisticated fiends but their is still one problem : why there are two different kind of fiend ? They do not have spaceflight technology I guess.

So it is possible the Kett have modified so heavily thier fiends that they turned blue and lost the fungi stuff, but i personaly think the red fiend just evolved to match his surrounding over a very long time, meaning they were implemented on different planets a long time ago.
In the 4k trailer we see that remnants :
-Are on several planets
-Take care of the eco-system not suited for that environment
-Only attack when disturbed
All these things draw me on the conclusion that the remnants were tinkering with life using their technology, and that the Kett try to take that technology for military purpose and modify/convert? their own. After all the "scorch" seems pretty organic. I would not be surprised if the remnants created both the Kett and the Angaran.

Still don't know why the remnants let all that stuff laying around, I don't think they are dead but are waiting around. We also saw a lot of weird gravity things among every trailer and the mention of Dark Energy, are they planning to use the old plot of dark energy destroying the universe ?

Perhaps 'Kett' is the genus, and the fiends and the smaller variants are species under that genus. Actually that would be an interesting touch; enough use probably isn't made of this in fiction.

There was a time on Earth where there simultaneously existed many species under the genus Homo; somehow only we survived (Homo Sapiens Sapiens), initially from a tiny population. Homo Erectus is probably the discoverer of fire, and Neanderthals may have had speech. If those guys hadn't gone extinct, our conceptions of 'uniqueness in the universe' would probably have never arisen; and who knows how that would have shaped the history of human cultures.

That's an interesting theme for a sci-fi author to tackle.

Don't ask me where I heard this because I can't remember, but I heard the Kett wear 'armour made of bone' - so are we certain that's actually an exo-skeleton, or could it be armour? Certainly the face part makes it look like armour to me.

The Kett seem to have similar sized hands to the Angaran (I recently noted (to myself) that Jaal has some big ol' hands on him). I'm totes on-board with them being in some way related.

LOL. No. The Kett are not the same race as the Angara. BW would really be shorting us on new alien species if they did that. I mean they might not be perfect with new alien species but no way would they simplify things to that degree. For one it would really really hurt the lore. Specifically, it would turn people away from the game who are really into learning all the different stuff within the codexes. No they would never play it like that. It would really be a shame if they did.

Thanks, this looks really interesting.

Humans don't share key physical traits with the asari, though. The kett and the angara share physical similarities that would go beyond coincidence and either point towards a relationship between the two species, or laziness on Bioware's part.

I think the Kett are like mutated Angara.

I don't see why.