I'm interested in both the RT and pro model for different reasons.
I'm not interested in the RT for its potential for games, but it looks like it could be a competitive smart device that will run ALL of the WinRT environment applications that are designed for Windows 8 (basically anything Metro). I think that eco system is going to be really healthy with the transition to Windows 8, co-developing apps or porting existing ones for it will be a no-brainer. Social apps, messaging/email, browsing, simpler styles of game - they're all going to be pretty awesome, and integrate seemlessly with notifications and images appearing in the Metro UI. It'll be really nice. And the hardware is sexier than the pro model: lighter, thinner, like a small pad of paper. Gorgeous design.
The pro model has more usability, like an ultrabook laptop. It'll actually outperform my current laptop for gaming, and I can actually run Dolphin @ around 15-25fps in some games, and run some games on low settings just fine. I'm still not particularly interested in it as a gaming machine, but I expect it'd get a lot of the popular games something like the iPad would get and even some of the more popular touch-games and graphically non-intensive games that you would see on Steam and services like that. Add to that things like digital ink, increased storage, x86/64 compatability - and this becomes an amazing device for creative productivity on the move. Working with web assets, I don't typically need a super powerful workstation to work on graphics or anything... I could do that with this tablet really easily, and anywhere I have this thing in my backpack. It'd be a great device for showing off work or portfolios at meetings and interviews. A great presentational device.
Both devices would be really cool with SmartGlass, and I love that it has decent inputs and outputs - unlike the iPad. Full size SD support (meaning you can use microSD but you're not restricted to it), USB for connecting mobile phones, storage, and printers (hell, you could even connect an iPad! ha)... the keyboard covers are fab.