I think from what Google demoed, it certainly looked to me that as of now, it's running a completely stock early version of Honeycomb. Whether or not it will stay stock I don't know, but it would make sense if it did. I think Google would be smart to work with an OEM on a "Nexus" brand of Tablets, especially since Honeycomb is essentially going to be coming in two flavors -- one for Tablets and one for Phones.