I can't remember where I first saw this, but I've noticed that adding ?tiger to the end of the URL on any Gawker Media property, sub-blog, or personal Kinja blog seems to "update" that publication to Kinja 1.2
— WITH NO TURNING BACK!. [UPDATED]
Just updated my Crosstalk to Kinja 1.2, and the new cat banner is now freakin' tiny. Also, "this is a post" is back, in the form of a tiny square avatar icon to the left of the banner.
ETA: Magister correctly points out that appending ?tiger=off brings back the old look.