i'm much more interested in the HD-izing of these games than the 3D. people who think 3D is awesome saw Avatar a few times too many - it really, REALLY doesn't work well in the standard living room, and with games that haven't been optimized to the level of Avatar, it slaughters your eyes after a few hours.
it's the re-releasing of these games, with better art, that matters. first God of War I and II, now ICO and SotC...you'd want to look at other major series that would likely get updates. Kingdom Hearts is a no-brainer, particularly considering the cartoony nature of the graphics. FFX combined with either X-2 or XII (or maybe both) are also no-brainers. i only include X-2 because it's one of the top-rated games of all time over in J-land, i'd personally prefer X/XII.
beyond that, i don't know what games i'd expect to see. those are the big console-specific money-makers that they wouldn't just make a sequel on the PS3 for (like Twisted Metal and Gran Tourismo). maybe the old MGS games? but i'd expect that to be a multi-platform deal, since MGS sold very well on the xbox as well as the ps2. DMC or RE are possibilities, but with the total series reboot to both of them (DMC upcoming, RE with RE5) i doubt it.