As someone who's beaten the game before, can you notice any difference in gameplay, graphics, or sound?
they didnt do much with the graphics but they did do a few little touch ups like changing a few textures for better looking ones in the first one, i havent even played number 2(only multiplayer, which is no longer a test of who can lock on best any more :D)or 3 but I have not noticed any diference in sound.
there are a few changes to gameplay however:
some of the bosses have had some changes, so I've heared, I havent noticed it on any yet though.
you may remember a glitch in the first one used for speed runs,which allows you to get the spacejump boots early, this is no longer in the game.
In the first and second games visor and beam swapping controls are no longer mapped to any sort of d-pad or anything, it is now a cool gesture system, to switch visors you simply hold the + button and flick the wiimote up, left or right to return to the combat (default) visor simply tap the + button, it is the same for beam weapons except with the - button.
finally there is a small but immensely useful difference in the morphball: in the originals you can use you bombs to jump upsmall ledges and whatnot but some of the higher jumps were very tricky. now you can jump the height of a bomb jump without a bomb, by flicking up the wiimote.