Apple is going to be showing its next iteration of the iPhone in January and whilst speculation runs rife over what it will actually be, reading between the lines of the snippets of information coming through from sources who have been reliable in the past it is possible to take a guess at what is coming down the line.
Is the new iPhone going to be a larger, tablet-style device? Probably not, although I'm sure that Apple will deliver a tablet device with a 7-10" screen sometime during 2010. Whether it will be a full Mac or iPhone based remains to be seen. The former would be difficult to achieve without the use of a stylus and the latter would be effectively be a super-iPod Touch.
I think the focus for the iPhone in 2010 will be Hi-Def. That means a much higher resolution screen (at least the equal of the 800x480 screens that other platforms currently boast), a higher resolution camera and HD video recording. This ties in with Apple's alleged contracts with component suppliers and its courting of the media owners with subscription models for its iTunes service.
If it pans out Apple will wound competing services and consolidate its position as prime supplier of content to the masses pushing iPhone sales higher and higher in the process.