The picture was released on January 18, 2012. They did the mockup using Reactor 5, and the photo is that of inside the Reactor 5 Containment Vessel.
From TEPCO's handout for the press (1/18/2012), Japanese only for now. The photo on the right side is what you would expect to see in Reactor 2's Containment Vessel. Not.
"Colonoscopy" of Reactor 2's CV using the endoscope from Olympus will be on January 19 in Japan. I don't know the time, and TEPCO is not saying.