Makers of Enemy Territory: Quake Wars
, id Software, have come out saying that the title will not feature cross-platform online play. Kevin Cloud said "Console players will not play against PC players...Consoles require a certain [adaptation], and that wasn't something that we wanted to take on." What he means is that it would be difficult to keep a level playing field between consoles and PCs. Because not all consoles support the keyboard/mouse combo.
However, don't think the console versions of the game will be handicapped in any way -- they're going to be the same as the PC version. Both will feature the neat action with little bits of RTS features to fight against... you guessed it, maniacal enemy creatures that want to destroy. Look for the game later this year on the PC, PS3, and XBox 360.