MEA MP will be P2P. Thoughts?

You may be able to play together though invitation. Although even then, if the game is anything like DAMP was, trying to bypass the region-lock may result in the game bugging out.

yep, if it's region locked, the players are deparated in world regions, for example south america, north america, europe, asia, etc all seaprated, culd be other kind of separation
we can only play with peolpe of the same region, 
but we still need a concrete technical answer from Bioware

This. Most of my games in ME3 were good so i have no problem with P2P and without dedicated servers they can keep online this data server much longer and keep the game alive.

If they impose region lock, I will never be able to tell the story of Hajzelkohút Part 4

Yup, one thing that made DA:I MP sucked so hard was the region-lock matchmaking.

But what matters is BioWare's motive of imposing the region lock in DA:I MP, what if they didn't want to separate the players, but still had to do this because of technical issues?

To test that I had used a U.S. VPN to play with U.S. DA:I MP players while lived in Asia, all I got was terrible lag and bugs (black screen, no UI, map won't load, dead enemies still attacking, etc). I asked those questions on the old BSN but got no response from BioWare.

So I guess what matters most for ME:A MP is whether BioWare has managed Frostbite engine's netcode now, if the answer is no, we will probably be doomed once again.

DAMP didn't have dedicated servers, it was P2P. Maybe someone in this thread gave you the impression that DAMP had dedicated servers but it's just a language barrier thing.

Today I had some good old ME3MP games. 4 players from 3 different continents. It took like 10 minutes to get everybody together. People could not connect to each other, servers were unavailable, eternal joining bug, those things we are all familiar with.

That is why I insist in saying that P2P is so outdated and even stupid for any serious mainstream game.
Sure, dedicated servers will not take care of the lag issue (though connecting to a server is far more stable than connecting to another user), people playing outside their region will be always be at a ping disadvantage. Nevertheless, it will be simply far easier and better to find players and not come across any of the several possible bugs that just plague P2P.

Browsing on Youtube today I came across this video in which someone is making a very thoughtful diagnosis on what is going wrong with For Honor and this dude blames the P2P connectivity entirely, as the very reason For Honor is slowing failing.
One interesting thing said by him is that while P2P works in games that do not rely on quick reflexes from the player (such as turn-based strategy games), in a game here fractions of seconds make a difference the P2P connectivity simply works against it.

It is also interesting that he points out For Honor is on Steam, where buyers are free to make a review of their purchase on the very store and people are just killing the game there, blaming the poor connectivity as the main issue. Bioware games on Origin are obviously free from this level of scrutiny. Besides that, being twenty days from release and no one knowing much about it helps Bioware getting a free-pass. In this day and age if a gaming company were to release a Beta featuring a serious P2P mess on a shooter game before release it would be disastrous. I wonder why we know so damn little about it...

And here I thought For Honor's downfall would be lolUbisoft, & lolUPlay.

Back in my day when I had reflexes and shit, I used to play a lot of Virtua Fighter 4 in a local Columbus scene.  That's an extreme example, where frame advantage of even 1 frame out of 60 fps can make the difference between your attacks landing as intended or getting countered.  Playing VF5 over P2P Xbox Live was a joke; while it was still "playable", valid strategies were out the window for whoever wasn't hosting.

I have a hard time believing a game like For Honor comes down to Virtua Fighter's level of precision, but I can certainly acknowledge that it could be an issue for the players at the higher end of the game's learning/skill curves.

It's also probably less of an issue with a co op shooter like Mass Effect.  I've played so many offhost ME3 matches I've gotten used to the lag, and it's nothing gamebreaking, unless you connect to RedJohn's Moon.  The only real issues are extreme rubber banding (which often magically stabilize after Wave 1), and powers not actually going off, even when they appear to do so.

ME:A is probably going to be fine as long as it's more like ME3MP and less like DAIMP.

They could integrate a background process for bandwidth and latency measurement into the game for the matchmaking screen. When players gather in lobby the game would automatically start testing the clients internet connections. When everything is finalized and countdown begins to start MP map, then the best client's connection would be the host, regardless who started the matchmaking. Same could happen if the host quits the game, a few second test to determine which client is best for the next host. No more lagfest.

That guy only has a 0.68 Mbps upload speed.