There are five apocalypses, covering what's happening to the stuff definied in the first five chapters of Programming Perl, and four Exegeses, explaining Apocalypses 2 through 5 for mere mortals, at perl.com. Search for Apocalypse and you'll find them.

The apocalypses are also collected up at dev.perl.org, as are the Exegeses.

If you want to play with what's been specified, there's a compiler in progress in Parrot that you can grab and build.