I'll note that WizKids' combat dial was pretty innovative for miniatures gaming. Did it stick? Don't know, but that could be the patented part of the problem.
Apple's iTablet will likely be a netbook version of a Mac laptop, or a larger screen version of the iPod Touch/iPhone. Not a bad thing, because there are SDKs that would enable developers to make software.
A device built specifically for RPGs is unlikely, the cost to develop is to high for such a small market. A multi-purpose device that has software and add-ons to support/run RPGs is very likely, as that trend has already happened.
As somebody else said, when rules management is fully automated, the divided in gaming styles will diminish because the rules wonks won't have anything to fiddle with. At that point, it'll be about play-styles, not rules.
A trend you'll see is a rule-set designed to be automated/managed by a computer. It might mean simplifying the rules in some areas (where it's hard to program) or expanding in others (where it's really easy to deal with).
Making new combat spells or weapons is easy, it's just a bunch of stats. Making funky abilities and interesting spells requires unique code to make it happen.
I would expect to see an app that lets you run your PC from your iPhone. Right now, I see HP trackers and character builders, but nothing with a focus on RUNNING your character as in looking up your stats and abilities (and associated rules) and making attacks and taking damage and managing resources.
Part of the problem is buying a piece of software is buying an opinion on a process. That means you buy Tool X, you're stuck with D&D version Y.
one thing I don't see changing is electronic games tend to feature less role immersion. People don't tend to get in character in WoW (except for the creepy people). For some reason, it's easier to get in character and act as a character with your friends at the table.