as of now, don't think there is gonna be much difference between Bing n the old MSN search. Looks like microsoft is just renaming it and hoping everyone will jump on board and start using it.
What i'm hoping is microsoft has finally figured the google's search code n closed down some of the gap they have between google and yahoo. also, this is another way for microsoft to get the advertisement revenue away from google and yahoo.
Guess, we have to wait and see.