AMD would be announcing its next generation notebook APU Carrizo-L in December. The processor is based on a 28nm quad-core architecture based on their Excavator core.
The notebook APU will have support for 2133MHz DDR3 memory. The news reported pointed out that Carrizo-L will succeed AMD's Beem and Mullins APU which is currently positioned for entry-level notebooks and tablets. It was also pointed out that this will also be 'officially' compatible with Windows 10. The rest of the operating systems, such as Windows 8.1, Ubuntu and SLED operating systems were added on the list.
The APU is designed for entry-level notebooks and will be placed to compete against Intel Pentium and Celeron series processors. But as far as mainstream segment is concerned, AMD would not be releasing the full-fledged Carrizo APU before March 2015 which will be succeeding after the long running Kaveri APUs. According to another report, Carrizo will be supporting both DDR3 and DDR4 along with an on-package memory die. It is also speculated that Carrizo series will have a desktop APU variant, which will be using the existing FM2+ socket motherboards. The expected timeframe for the desktop variant is also assumed for March 2015 launch.