Posted by A new iTerm2 beta and associated tmux release occurred a few days back. You can find the downloads at the project page.
I have updated the tutorial i posted a few months back, to reflect the (modest) changes — also, working from a clean OSX 10.8.2 install, I ran into a few new bugs, all of which were solved easily using homebrew (if you don’t have it, get it — my home-brew tutorial is here)
ricardian ambivalence 