I'd love an FFV and VI remake done in the style of FFIII and IV for the DS (although they would be higher quality if for the 3DS or Vita).

It's not so much a remake, but a remaster of FFVII, VIII and IX that I'd love - keep everything how it is, just re-render backgrounds at HD resolution, improve loading times and any bugs or quirks in the mechanics, record a live orchestra or band's interpretation of music (not just feed the original MIDI files through a new sound engine), and put in new higher quality character models that fit the original design (not like those crappy FFVII PC mods).

They definitely need to make an FFVII sequel, they kind of left it hanging at the end of DoC. Though I'm sure many have different opinions on what that game should be (mine would be another full-blown JRPG).

Chrono Trigger and Chrono Cross could be remade, they're quite beautiful games! Maybe even a sequel to tie them together better.

I absolutely would love a real-time version of Riven: The Sequel to Myst. There's a fan group currently trying to put something together in Unity, and it's looking pretty amazing. But something official with the resources to pull it off on a commercial-level would be fantastic!