Better performance. There is no reason the devices they put out should be weighed down so heavily by the UI. I hope they refine touchwiz and make it run buttery smooth like it did with the s2. Refine and cut out most of the crap, while keeping some of the better features in there and you will have a winner samsung.
Hoping for a better material for the body of the phone and TouchWiz to be trimmed down and improved performance.
Expectations? Slightly tweaked UI, better performance only because they're going to have insane specs there, and probably the same cheap plastic :-\