iPads equipped with 4G are showing up in Apple's inventory ahead of the iPad 3 event according to a 9to5Mac source. This would mean that 4G would not only be for US models, but for international models as well. This lines up with our recent prediction that the iPad 3 would indeed be equipped with LTE.
The 4G equipped variants are showing up in Apple's system as the following -
MD369LL/A – IPAD WI-FI 4G 16GBLACK – USA.
If this is the lower model, it would also debunk the rumor of Apple releasing an 8GB iPad. That didn't seem likely , anyways , nor did the rumor that they may do away with the 64GB model. If the screen gets an overhaul like we expect, consumers are going to want that storage for high definition content more than ever.