Spent a bit of time this arvo playing with the apk files from the 4.2 leak and decided to have a shot at backporting the launcher to work with Jelly Bean.
Pretty much all that is changed is a couple of strings which are obviously using new 4.2 things (but seem to be irrelevant to the launcher's functioning - stuff like accessibility levels I think they were), and changed the target API so it will work on 4.1.
It can be downloaded here:
Not sure what's new, but to me at least it seems a fair bit snappier at least compared to nova and apex.
I installed it like a normal app and it worked fine, but if you have the stock aosp launcher installed you may want to uninstall it.