I support voice overs if it's in same level what it was in baldur's gates and PS: torment.
An example from character which I liked most in BG1. (Video includes all his voice over lines from the game)
House/stonghold/castle/etc. where you can store your goods and companions is good to have, but not necessity.
Romances are think that add depth and play throughts to game if they are well writen, but if they are same carpage what most of the modern urban fantasy books are full of then they can only give bad rep for the game. So my opinion is add them if you feel that you can do decent job with them, but don't force yourself to write them, because that probably don't end well. If you think that you can do great job with them, you should be resticted to write any and reason for this is above-mentioned modern urban fantasy books.
What comes to Bioware(EA) cooperation, that is stricky question, because Bioware is full of talented persion, it is big studio with great recourses, but is also part of EA and so cooperation with them also means cooperation with EA and that means that Obsidian must struck some kind deal with EA which profits EA as big corporations don't usually do things that don't profit them some how. And one must also take count that Bioware has now bad rep with many old school rpg fans, which may or mayn't be deserved.