Did you see the whole ps3 video? After the end of the prologue, how much different Haven is on next gen (compared to the bit we saw in the ps3 video)?
I watched the whole PS3 video (three parts I believe) and the prologue up to the point where you leave your cabin is pretty similiar to the next gen (apart from the obvious graphical issues), if you do not leave immediately (or return at any point) for the hinterlands you can look around Haven first and get some side quests to improve the Inquisition, get some resources to build weapons and armour, talk to companions/advisors etc. There are a lot of NPCs busy around Haven and there is a feeling that even in the beginning that its the base of operations for your forces.
I'd have to see a video of the same area after the prologue to be sure, but if the crowd scene is an indication of how many NPCs are around Haven then your companions, advisors, merchants, healer etc that you can talk to in and around Haven are going to outumber the background NPCs who add so much to the atmosphere of the place. It makes Kirkwall in DA2 feel over populated.
The layout of Haven from what I can see seems to be the same as the next gen, just minus all the background people.