The third consecutive beta firmware (version 4.8.04-05) for the 8320HD has been released and can be downloaded here. The installation instructions are on Latest Firmware page as usual and I have applied to my 8320HD. On initial testing it actually seems to have largely fixed the remote control repeating bug, which is a huge relief.
However, two obvious bugs are still present - the repeated video slats in the bottom half of the screen during high speed FF/FEW and new bizarre bug that live-pausing SD programmes fails to hold the pause (it is released after 1-2 seconds). It's bizarre because HD programmes don't seem to be affected and will hold the pause as you would expect.
According to AVForums.com postings, Sky Player may be broken with this latest beta release. I could get all the way to the login screen, but I have no active subscription (only used the free month, which was so awful, I'd never pay for it) so it was tricky to work out if it was locking me out because of that or a firmware bug.