Dig it: http://en.wikipedia.org/wiki/.mobi
I'm about to go to sleep, or I'd write more, but basically a www.website.mobi is a top level domain for people to access optimized versions of websites on cellphones or other portable devices.
a 'http://skyrim.mobi' site would typically be the mobile version of whatever the 'http://skyrim.com' website is (will) be.
The .mobi address suffix does not mean "OMG Cellphone Game" it means "boring re-optimization of a website to be viewed on a teeny tiny screen".
Chill out.
Seriously, read it yourself http://en.wikipedia.org/wiki/.mobi
Edit, a .mobi skyrim website might well suggest that they think the skyrim.com address is going to be so popular that people will be checking from their phones, just sayin.
Also, has anybody tried to access the skyrim.mobi address from their cellphone (probably not even a smartphone) or in an emulated mobile browser with the appropriate flags? I don't have need of a cell in my day to day, so I can't test it myself.