My guess is only after the possibly ICS 10" tablet is released to the public. It is not stated that the 10" will be ICS, but it is the smartest choice for Vizio.
Chatted with a Vizio Rep last week and asked them if there were plans to upgrade the VTAB1008 to either JB or ICS. The answer was (and I paraphrase) "No plans at this time, but that doesn't mean we won't in the future". I got the same answer when asking about enabling root on the VTAB1008. Take it for what you will.