I'm guessing that they have a few OpenSparc cores on those ASICs. It's quite cool - there are a few open source implementations that you can download (as VHDL) and write onto an FPGA or use on an ASIC.
I'd also guess that the ASICs are doing all the heavy lifting in encoding the footage, and doing the demosaicing and debayering it for the video outs and the preview. But the UI and control systems and most of the other features I'm guessing are going to be running on the processor (which as I said might also be part of the ASIC, but would be running firmware off flash memory or something).




