They've fixed several bugs including an import problem which H.264 444 video files are incorrectly decoded as 422. One manifestation is green artifacts.
There are close to 100 updates. Read the full list here.
Get Adobe After Effects CC with Adobe Creative Cloud for Teams
Price Drop! First Year Pricing of Creative Cloud for Teams at $39.99 a Month Through August 31, 2013.
In Depth: Plug-ins Adobe After Effects CC and Premiere Pro CC
FAQ: Adobe Creative Cloud for Teams and Common Questions
Adobe CC Tutorials – this list is growing fast!