Finally, after a delay the Battlefield 2: Modern Combat demo is out on the Xbox Live Marketplace. Running at 382.12MB, it is one of the smaller demos on the marketplace and only offers one map, one mode, 24 players max, 1 helicopter and 3 different vehicles on each side.
Should be interesting to try out. One of the things that people are scratching their heads on is the lack of a lobby, but the invite system seems to be working well enough for now.