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Nope it won't. There's really no point to it. For COM, it was made because not many people were aware of it and because not a lot of PS2 owners would have a Gameboy. But for BBS, there's already so many people who pre-ordered it and it's getting really known to a lot of people now. It'd be like making a port from KH1 and/or KH2 to the PS3... unless they add "special additions" and "behind the scenes" stuff then it'd be pointless because all it would do is boost the graphics.
There are other good PSP games too like GOW Chains of Olympus, Dissidia, Crisis Core, and old-school FF games including PS1 classics available for download. But I don't know if you're interested in those games :/
Oh god, why?! You want to push KH3 back even MORE. I hope it doesn't happen. No need for unnecesary ports unless the game was really bad or it is necessary.
You do know that there are several teams that work on the various KH titles? And the one team who will do KH3 is busy on Versus? So ports and side games or no ports and side games, it has nothing to do with how fast KH3 comes out?
That said, I think all the teams are busy at the moment (h.a.n.d with Re:Coded, Osaka team with KH:3D) so I don't think they're free to make a PS3 version of BBS anyway.
HA! I'm sorry, but that is never going to happen. KH will never be on PC. Unless they make a Keyblade War MMORPG
If there was to be a "kingdom hearts collection" which i think is likely to come at some point, i think it would only include kh1 and kh2. Dont see anything else. I think sony is only releasing 2 games per collection.