While everyone was busy trying to see if they actually bought a Nexus 4, the newest version of the Nexus 7 has sold out as well. The Nexus 7 with 32GB of storage and HSPA+ connectivity held on for a whole 36 hours longer than the Nexus 4 and 16GB Nexus 10 did, but is finally no longer for sale. The 16 and 32GB Wifi models are still available, however.
Looks like people do want mobile data enabled tablets after all. Hopefully they'll be back in stock soon enough along with the Nexus 4 and 10.
Source: Google Play