Not only will MotoGP 09/10 feature all the racers, tracks and teams from the 2009 season, the game also features what Capcom is calling the most "comprehensive Career Mode of any previous MotoGP title".
What comprises the most comprehensive career mode ever? Players will be responsible for hiring engineers, managers and press officers in order to progress in their career, winning races and making a name for themselves on the road to the MotoGP World Championship. Your team will research upgrades for your bike while you are racing, earning reputation points that make you more attractive to new sponsors and prospective team members.
On top of all of that, I hear you'll be racing about on a motorbike a great deal. MotoGP 09/10 is due for release next March.