Well, this weekend I put the new 4311 into the system, and it works a treat running as a prepro to my IPS-1. Sounds excellent, Audyssey MultEQ setup was straightforward, and no problems with video, menus, or sound dropouts. At least not yet. But I do have a few observations on this unit.
1. It does run a little warm, and I would give plenty of room above it in a rack, or add a fan. I measured some temps with my point-and-shoot IR thermometer, and found temps of about 104 at the front, increasing to about 108 at the back. The back has all the computing, and the video and DSP chips are running about 125 or 130, so it's warm back there.
2. I checked the temperatures both in Preamp mode and Normal mode with the amps not connected to any speakers, and got basically the same values. I was a little surprised by this, since I thought that preamp mode actually turned the power off to the amps. That doesn't seem to be the case, since the temp was 104 above the amp boards.
3. Re the DAC questions, there is one AKM AK4358VQ 8-channel DAC and 2 more AKM AK4424ET 2-channel DACs. I think that's enough for 11 channels.
4. There's undoubtedly another board underneath the digital one we can see - that's where all the analog stuff is, and also perhaps the ADCs.