It is fairly complete, alas, no docs yet. It's accompanied by Urb, an Irb and Pope based shell, with full job control support and many readline-related enhancements (see also irb enhancements, which is a backport of these enhancements to basic Irb [now it could do with and update...]). Urb is both a ruby library which makes interactive access to these features easy (so you use valid ruby code as shell) and an alternative reader which understands a subset of Bourne shell (and translates that to ruby). The alternative reader (called Pidginsh) is under development.
TODO:
The code is stored in a Mercurial repository, which can be found at
http://mercurial.creo.hu/repos/pope/.
(If for some reason
you don't want to use Mercurial, you can get the latest code as a tarball from
http://mercurial.creo.hu/repos/pope/?archive/tip.tar.gz)
A short description somewhere between a tutorial and a teaser is available here.