FUD Zilla reports AMD's 2013 Kaveri will support DDR3 2133 memory:
The third generation Fusion, or the third generation APU, has up to four Steamroller CPU cores, new DirectX 11 GPU, FS2L socket and DDR3 2133 support. This is the highest DDR3 spec we’ve seen to date and even DDR3 1866 for Vishera and Trinity sounded quite nice.
The codename that AMD wants to talk about is wrapped around Kaveri APU. AMD has revealed in its financial roadmap update that Kaveri APU is a 28nm mainstream part, while Kabini essential level APUs replaces Bobcat-based Brazos 2.0 and they both should be manufactured by GlobalFoundries.