Briefly, from some of the other features that are appearing on new handsets, I would like to see or rather expect to see on the 4G iPhone; Without a major handset design change ( I think the iphone is sleek and elegant ), I do think a big leap will be made to the UI. The functionality is already in place with the iphone, theres no handset ive encountered that can match the fluidness that iPhone OS presents. When I say fluid, I mean the responsiveness of pinch to zoom, and the way things fluidly move in the os....Now, people want things the way they want things, GIVE US CUSTOMIZATION STEVE!!! Android OS, great layout, not perfect or the best, but widgets, different home screens, etc really appeal to me as features I would like to see on the next iPhone OS UI. Did I mention FLASH support??/
Hardware features I think are a good possibility are.....Better camera capable of HD resolutions, A FLASH, front-face cam for video conferencing, 64gb and 120gb models, and HD screens....Thats just my 2 cents.