There's also the fact that Chain of Memories used a totally different graphics and play style then the rest of the series, with Re:CoM being closer to the rest of the series. Since BBS is already made to fit the rest of the series, I see an update like that pretty unlikely.
Re:CoM's battle system was the exact same as CoM on the GBA. In fact, it was harded to play on the PS2.
BBS is more a fusion of CoM's and KH2's battle systems.
Battle System's have nothing to do with the 'Re:' games. It's just what Nomura did with CoM as a special addition for KH2FM+ (The + in KH2FM+ is because of Re:CoM), and so that Coded isn't limited to the very small amount of people who could play it, which was very, very small.