Just for a little bit of reference, here are the previous years' pranks.
2010: Dave gets bought by one of the big equipment manufacturers and is only allowed to to review their products. (The oh so famous DS1052E hack video, EEVblog #70 was released just a couple of days before this btw.)
2011: The 555 Easter egg, using Dave's patented wire under mat technology this time as well.
2012: Extech LP100 Laser Test Probes. I'm not sure if this was all Dave's doing or he was running with an actual joke from Extech. I can't find any references to the Extech LP100 that don't quote Dave's video.