I'm not going to hold my breath...
hopefully within weeks of the official release.
If they are just doing a vanilla version like honeycomb that should speed things up a little bit, right?
We will see ICS on the XOOM before any other tablet sees it.
The only exception would be if a surprise GED tablet is announced and released freakishly fast. ;-)
For now, the XOOM is the only official GED tablet.
My guess is february
xoom is a google experience device (like a nexus) so we get pure vanilla android/quicker updates