I would think that being one of the first launch titles for Xbox Live! would garner enough interested in a sequel for MotoGP.
You can count me in as being first in line to buy it, although if it's only going to have updated rosters and bikes, I would push for that stuff being included in a downloadable update instead of a new $50 disc (ahem...EA).
yes they are working on a new version.i would link to it specificly but it's on the xboxlive forum site,which i believe you have to be a beta tester to access.motogp also has a website and forum were i believe one of the programmers has posted screens.