The design of the Perl6 language
This is taking place primarily on perl6-language and Freenode#perl6 and is probably going to take about another year to fully complete. The vast majority of the language has been specced out and you can use a lot of it right now in Perl5.

And in the meanwhile evolution doesn't stop:

Me too. If it's any comfort, just think of the design of Perl 6 as
a genetic algorithm running on a set of distributed wetware CPUs.
We'll just keep mutating our ideas till they prove themselves adaptive
+.
- Larry Wall in p6l, "Re: Adding linear interpolation to an array"
[download]

It may seem sucidal at first sight to keep the doors open to further enhancements and changes in the basic syntax and semantics while there's an implementation being written -albeit an "unofficial" one-, but so far there's not been evidence of any major issue related to this. So I'm very positive about future developements!