"To offer some differentiation from its other iPads -- which start at $329 for the iPad mini -- Apple is targeting the new model primarily at professional users, including those in the architectural and medical fields who handle large files. Gamers, movie fans and avid magazine readers are also likely to appreciate the extra storage space."
Apple releases new iPad with 128 GB of storage - Jan. 29, 2013
The next iPad I buy will have 128GBs. I'll wait for technical upgrades first, though.