There are some screenshots here, presumably for the iPhone/iPod version:
http://www.videogamer.com/iphone/bro...reenshots.html
The graphics don't look very different from the original, which I'm actually replaying right now (running it perfectly on ScummVM) -- aside for the character portraits, of course.
I didn't play the remaster of the original game, but just by looking at some videos on YouTube, I wasn't all that impressed by the portraits. Especially considering they sometimes took the place of character animations.
But who knows, maybe Revolution will do a better job this time round. Remember LucasArts' first attempt at the Monkey Island remake compared to their polished effort in MI2:SE.