The GTX TITAN, GTX 780, and several other cards have been added to the list of cards that After Effects will use for GPU acceleration of the ray-traced 3D renderer in the After Effects CC (12.1) update, coming in October.
See this page for details:
http://adobe.ly/AE_CC_12dot1_details
---------------------------------------------------------------------------------------------------------
Todd Kopriva, Adobe Systems Incorporated
After Effects quality engineering
After Effects team blog
---------------------------------------------------------------------------------------------------------