Awesome! I'm hard pressed to think of a third party tool that makes more sense for core-inclusion than virtualenv. Hoping the virtualenvwrapper stuff will also be included (or at least similar commands will be)
I use a number of zsh functions and hooks as porcelain to virtualenv so that it behaves like oh-my-zsh bundler support [0] (which I've shamelessly ripped of and tweaked too) i.e being inside foo directory is sufficient. This works especially well since new tabs open straight into the current tab's wd.
[0] https://github.com/robbyrussell/oh-my-zsh/tree/master/plugin...