At the moment, Google and ASUS' Nexus 7 tablet comes in two flavors, 8GB and 16GB. Without any form of expandable storage through microSD cards, it makes storing large amounts of data on the tablet impossible.
There are now teases from Staples Advantage that point toward a 32GB Nexus 7 with an availability of October 18 - this is most likely a placeholder date, but it might be a sign of things to come. As you can see the 32GB model is priced cheaper than the 16GB model.
This might be a move from Google to replace the 8GB model with the 16GB model, putting the new 32GB model in the same price bracket as the 16GB model.