I happened to be sniffing around the neowin forums when i came across threads containing links to two new trailers. One for UT2007 and one for C&C 3 so i thought i would share what i found on there:
UT2007: Standard Def - High Def
If your lucky enough to have a gamespot account then you can get the HD version form there too else you'll need the second link.
C&C3:
Standard Def - High Def
EDIT: IGN have some new vids showing some actual game play.: here
Im really looking forward to both of these games tbh. I think between now and then end of 2007 could be a great period for gamers, there looks to be some nice stuff comeing out i have to say.