Hi Carl,
We haven't released an official roadmap, but we have been rolling out fairly regular updates (some large, some small) since we first opened the Tech Preview. We'll have a
lot more to say about the future of Live Mesh at PDC08 in October (you take a look at the
sessions list if you're interested). In the meantime, keep your eyes open for more updates - we have a lot of good stuff coming down the pipe. :)
Thanks,
Ben.