The C&C 3: Tiberium mod for Red Alert 3 is a recently announced mod that transfers Tiberium Wars to Red Alert 3, taking advantage of the optimised SAGE/RNA engine that Red Alert 3 has.
http://www.moddb.com/media/iframe/1097627
Features:
Total Red Alert 3 conversion-transformation RA 3 to C&C 3 as close as possible
Improved engine (RNA renderer)
Remake of Tiberium Wars maps and include them to RA 3
Naval war and water base build support
More stable LAN and Online
There are plenty of screenshots and extra details on the C&C 3: Tiberium Mod DB page.