Just a quick note to announce that I just upgraded my Mac (OS X Lion) to Emacs 24.2 from source. The upgrade went without any problems so if you're on a Mac, there's no reason to wait.
From the top level Emacs source directory do
./configure --with-ns make install sudo mv nextstep/Emacs.app /Applications
and relaunch Emacs. That's all there is to it.