Perl 6 is a completely different programming language and is generally unrelated to Perl 5 except in name, history, and a common group of comitters and users.
Perl 5 releases a new major version every year, and a new development version every month. So 5.16 will be around next spring, and 5.18 will be around the spring after that.
With thousands of users around the world, Perl 5 is not going away any time soon.
As jrockway said, Perl 5 and Perl 6 development is mostly decoupled. I write some code for Perl 6 compilers, and now and then contribute a (most often doc) patch to Perl 5.
Both move along nicely, and Perl 5 gets many inspirations from Perl 6 - not the least of it is a time-based release schedule, which is why you see many more releases of Perl 5 in the last two years.
