Hi Michael,
10.1 gets you application multicast for audio/video streaming. I don't
think you'd see a difference in video quality though - it's all the same
codec. You should be able to adjust picture quality on the
ScreenSharePublisher - have you tried that?
We've actually studiously avoided mentioning any updates to the screen
share addin =). We don't have this coming up any time soon, although we have
made fixes to bugs in the screensharing workflow. The release is coming soon
(weeks, not months), and you'll get a list of fixes then.
hope that helps
nigel