I know what he's saying: Peter Jackson's Halo Chronicles is much farther away than you think. Fall 2010. But they still want to show it, so why not open the floodgates?
Also, I think this will be a confirmation that the 360 WILL be around for much longer in the future (remember the annual "nothing announced for next year means the nextbox is coming" comments/threads), and teasing for 2010 games will help solidify that.