a remake of melee would be kind of silly... considering that there are only 2 gens of pokemon on it compared to 5 gens now. if anything i would just expect another super smash bros done by somebody else, seeing as sakurai has left HAL, for the 3ds in about 2 years.
as for remakes from the cube, i would say sunshine, metroid prime, pikmin 2 and doshin the giant (always wanted to play that game.)