It does make sense for a possible release in October. Despite the fact that Bioshock will be released in the same month, it all comes down to how much they advertise. After Max Payne 3, GTA V news will be everywhere. Bioshock and GTA are two different genres and probably attract a different crowd of gamers, but that also gives them November and december to go on a pre-release advertisement rampage leading up to christmas. But who knows, they might delay one title to get the most out of sales.