The desktop Richland APUs will use the Axx-6000 numbering scheme and should be supported by current Trinity motherboards after a BIOS update. AMD will use release three new chipsets for Richland though; the A88X (eight SATA 6Gbps ports), A78 (six SATA 6Gbps ports) and A68 (likely with four SATA 6Gbps ports).
Here's an overview of the Axx-6000 series, courtesy of TPU:
The series will be led by AMD A10-6800K, which features every component on the "Richland" silicon unlocked, which includes two "Piledriver" CPU modules amounting to four x86-64 cores, and all stream processors on the iGPU unlocked, with the highest CPU and iGPU clock speeds enabled in the lineup. The iGPU model for this chip is Radeon HD 8670D. The A10-6800K features unlocked multipliers, making overclocking a breeze. Trailing it is the A10-6700, which features all physical components unlocked, but with slightly lower clock speeds, and locked BClk multipler. It features the same iGPU as its bigger sibling, the HD 8670D.
The AMD A8-6000 series consists of the A8-6600K and A8-6500, both of which feature four CPU cores, but slightly toned down iGPU cores, labeled Radeon HD 8570D. The A8-6600K features unlocked BClk multiplier. The next APU in the lineup is the A6-6400K, which is dual-core, features a further scaled down iGPU, bearing the model number Radeon HD 8470D, and unlocked BClk multiplier. Lastly, there's the A4-6300, an entry-level dual-core APU with Radeon HD 8370D graphics. All models with -K extension feature rated TDP of 100W, others 65W.