The Xoom was SUPPOSED to be the first preICS tablet to receive an ICS update. A different tablet has already debunked that claim.
So, there's no news as to when we're going to be getting an update, unfortunately. But, we ARE getting it. Some have speculated it may even be down to a few weeks. There's no set date, though.
It looks like they are rolling out ICS this weekend on many XOOM devices. I have the update.zip file if you go on Droid-life.com you can find the article