"Dell has shown off a 5-inch 'slate' PC style device at the Consumer Electronics Show (CES) in Las Vegas." Via
- This is how I think a tablet computer (Slate) would look like. Exactly so big so that it will fit in a pocket. This is what I think Apple will launch - The next iPhone will probably be a bit bigger than now. Between 4-5 inch.
I also believe that iPhone OS 4.0 will have support for max with 100% and max height 100% resolutions so that apps can fit on iPhone 3GS and also the next bigger iPhone. Apple has already asked some developers to change their apps to fit bigger resolutions, so this will be it. A bigger iPhone is the rumored "Tablet".