halo wars preview....beware, it's a 81 MB file: http://download.microsoft.com/download/9/8/e/98ee533a-af33-4a28-8f6f-b2b5f56d988e/HaloWars_ESRB_720p30_ST_8Mbps.wmv
Or 14.1 if you'd rather: http://download.microsoft.com/download/8/4/2/8427e8fd-b392-4099-ae1b-d626a71dc617/HaloWars_ESRB_360p30_ST_1500kbps.wmv