As far as I know, TCW on the UDK will have a game mechanic that works close to command and conquer mode, that we know from renegade.
Keep in mind that if EA (which has won an award as the worst company of the US) cancels a game because it is to worse, it really has to be worse. Tiberium was almost about one weapon, and as far as I know it already was canceled long before they figured out how to build it for multiplayer. So probably it would be ended as an game without gameplay or storyline, just shooting and shooting. When you imagen that the story has taken place during the C&C3 period, where there wasn't a walker or what ever you call it, used. But in Tibirium they where. So it would conflict between these 2 stories. So when you all the failures filter out of the game, you would only would have a multi-usable gun left.