Although you will have the bandwidth to do a high quality video chat if you’re on a 4G LTE wireless cell network in the US, you wont be able to Facetime unless you’re on wifi.  Word has begun trickling out (I saw it first on Cult of Mac) that the carrier-imposed restriction banning video chat over cell towers will remain in place as the iPad 3rd Generation gets into people’s hands this weekend.

The only upside to this is that you won’t have the chance to accidentally blow through all of your monthly allotment of data for your mobile plan.