This is prognostication without information. Do not mistake it for TRVTH. Feel free to point and laugh when Apple announce something completely different next January!
Leaving aside purely local issues (such as an iPhone 4 that works on Verizon's CDMA network in the USA — not terribly interesting to non-Americans), I think Apple will, in 2011, seek to revive the Macbook Pro range, differentiating it from the Macbook and Macbook Air by adding new tech. Intel's LightPeak optical bus looks set to offer a long-term replacement for Firewire and, probably, USB 3.0 (which hasn't gained traction — at least with Cupertino). And when Intel get over their packaging issues, there's a chance that the Macbook Air range will get a modern CPU — probably Core i3, once it's lost enough girth to fit in a slim case.
But Macs are so 21st century ... the iOS platform seems to be the future for Apple, but I think there's a gap in the range.
We can be fairly certain that Apple is gearing up to launch a second-generation iPad in early 2011. What will it look like?