Do we get to pick our Golden World?

They call habitat 7 new Earth so it looks like they may have been at least provisionally assigned to species. But I imagine that will change through the course of the game.

I kind of got the impression that Habitat 7 (new earth) wasn't actually going to be habitable and we would be somewhat forced to find a way to colonize one of the other habitats... probably involving sharing a colony/planet with at least one other species.

So, part of it probably depends a lot on what alliances you make and who you piss off in the process.

I highly doubt habitat 7 as they call it will be habitable, especially with that lighting space cloud near it, and so we will go down to the planet or the tutorial planet which I am sure it will end up being. Find out that its not habitable, forced to leave and forced to find a new planet for the people that is still frozen

I was thinking possibly we find out the cloud is a creation of the kett or something they've caused somehow and the main course of the game is to find a way to get rid of it to make habitat 7 habitable.

Could be miles away though!

If I remember right, it was mentioned that we'll be able to colonize several planets, but not all of them, since the amount of colonists is limited. As above mentioned there needs to be one "canon" world with humans (or all of them), so probably one of colonies will be mandatory.

At least according to the first 11 minutes anyway...
They start it out by stating that world is Habitat 7 and is surrounded by this shroud.
I actually think that we may actually get to choose where humanity will settle in the end.
I DO NOT MEAN that we get a plethora of worlds to choose where humanity can fall into safe harbor but maybe down to 2-4 worlds to choose from.
This game is supposed to be a complete story with a complete ending -according to Bioware anyway.
That does not mean a sequel may not happen; -just does not mean that it will be a direct continuation from ME:A.
I am already getting the dreaded inkling that ME:A is following the Dragon Age style:
Player character story is done by each game end but in the next game they make an appearance be it in speech or visual to continue connectivity.
As much as it may feel awkward; make sense they would follow this path though... makes it easier to tell more stories -that while separate can still be connected.