I don't think they are going to delay it, the reason being, because as soon as they announced that PvP was not going to be included during the initial release of the game, but would be downloadable as part of a patch, we ended up getting the announcement of a firm release date.
I think so too. It's already been pushed back a few times. If it does come out in May than hell yeah but if not, oh well, I've already been waiting this long so whats a few more months or whatever. Just as long as they're doing everything to make this game as awesome as the first two than I don't mind how long it takes.