I don't know about anyone else, but after DAI has been released I'd like to see the metrics on the accent type that most players chose, further broken down by race. Would be really interesting.
I suspect that the majority of dwarf players would choose the American accent, mainly because it falls in line with how the dwarves have been characterized thus far, with a few exceptions among the NPCs. The same might be said of the qunari, but we haven't had a qunari PC before so I think that's iffy.
For humans and elves I really have no idea. For myself, it depends on the background of the character. We know that the elven Inquisitor will be Dalish, so I might choose British for that. On the other hand, they did have the American accent in DAO. For the human, I will most likely choose the British simply because it is how the humans sound in these games. However, I can see some American players picking that because it would be a closer representation to themselves.
You know, after the game is released I might make a thread about this: What accent did you pick, and why? Should be fun. 