The V3 is a work-in-progress and a release not imminent. Lot's of mad scientist stuff going on. The V3 would incorporate a mild accelerator, inspired by the ICD AdSpeed.
Dunklee:
I'm finding that memory access and latency... even on the Parceiro is slowing the 28MHz down to an effective 16MHz or so. But it's progress.
He's also found new ways to significantly increase the SD card reads and writes. Without his accelerator, 525KB/s on SDWorkout. With the accelerator, more in the 1MB/s range!
It isn't clear as to when his experiments will convert to a "Gold Master" product. I'd guess 2023, but I really don't know. Very exciting stuff, though!