A lot of backers will be in the early beta test for the game so i suspect that final bug count will be minimal at the release. Just look how long WL2 is getting delayed because of this kind of testing and KS approach, and backers do not have much problem with that (at least I get this feeling). If I am not mistaken, originally WL2 should be released in 2013 and its not going to happen
WL2 is delayed indefinitely because, frankly, the current state of it is very incomplete. It's not because bugs need to be fixed. We're talking about a combat system that's essentially ordering everyone to shoot, then clicking on end turn. That's the tactical depth of it at this time.