The folks over at ComputerBase have leaked one of AMD's roadmaps, the desktop CPU roadmap for 2013. From this roadmap, it appears that the Kaveri APUs will feature a completely new CPU and GPU architecture. The Richland APUs were merely a minor update to the Trinity platform, offering nothing more than small performance improvements.
Moreover, it also shows that the Kaveri APUs will come with a new socket -- the FM2+ socket. In all likelihood, the new socket will not be an FM3 socket.
The APUs will feature from two to four Steamroller CPU cores, making Kaveri the first series of desktop CPUs/APUs with the new 28 nm Steamroller architecture. The GPUs in the units are expected to be part of the Sea Islands series, which are built on the GCN architecture. The new APUs would also support the new HSA applications. This, along with the hUMA architecture, would allow the CPU and GPU to communicate much more efficiently.