It's still in sunrise. (http://pc.mtld.mobi/switched/faq_registrar.html) As from August the 28th, 2006 general registrations will begin.
crap that crap I generally don't like 4 letter extensions, except .info is alright. And I'd probably never pay anything over $10 for a domain at registration
Mobi would not get a land rush... it isn't too attractive for an extension and its way too overpriced IT