Well, after reading interviews during the progress of making the games, it seems like Days has been the hardest game to make. Probabky because it's been hard to get everything to work as it should on the DS. While it seems like making BBS has been easier. So since Days was planned to get released first and they wanted to release it first, I think that BBS has been delayed because Days has been delayed so many times. So I do actually think we don't have to wait for too long for BBS to be released.
But.. I think it will still take a couple of months, so summer 2009 might be a bit too soon especially when we haven't heard any announcments about it yet.