Well, one for one its incomplete for sure and some of the lag etc. in it is not particularly flattering, even if most folks would realize its not representative.

Secondly, it could well be a few months old and not what exactly what its like anymore.

Incidentally, a guy on thenokiablog comments claims a guy he knows (yeah I know..) works on the N9 and says the current UI is "much nicer".

Btw, also heard from a guy that talked to someone in Nokia (yeah, double "yeah I know..." ) that the N9 announcement in Nokia World was postponed "so as to not steal N8's thunder"... uncharacteristically I will no say: WTF!!!! I hope that not true as it would be one of the stupidest moves among many Nokia has made.