This year's organizers took specific pains to attract deep content, and the schedule reflects that: there are very few slots where I'm not torn between two topics. This will be great fun!
After a little introspection, I did not submit a talk this year. My work in 2012 was with Linaro helping with KVM on ARM: that topic is better addressed by Christoffer Dall, so I convinced him to submit (unfortunately, he withdrew as January became an untenable time for him to travel). My other coding work was incremental, not revolutionary: module signatures, CCAN nor ntdb shook the ground this year. There just wasn't anything I was excited about: a reliable litmus test.
See you at LCA!