I would really want them to reanimate the cutscenes. Since because of budgetary and time constraints(the game was only developed in 10 months),SA1 never got to have properly animated cutscenes, so doing this would be awesome. Another thing I would want is the cutscenes to have more life, motion, and expression. Most cutscenes in sonic games are really stiff with characters just standing there so following of off the style Vicarious VIsions did in the N-sane Trilogy. But they should still keep some of the legendary moments ....
They must keep these.