Perl 6 has a fun-driven community: writing Perl 6 compilers is fun, developing applications in Perl 6 is fun, and so is dealing with friendly, intelligent people.
Perl 6 will support its still-advancing big sister (Perl 5), and future versions of both languages will support increasing degrees of interoperability.
Perl 6 is defined by the Perl 6 test suite (which are in turn based on the Perl 6 language design documents), not by conformance to a reference implementation (as Perl 5 was).
While Perl 6 has been an infamously long time in development (see below), it has been relentlessly advancing along the long road to "industrial strength" in the last few years.
New pre-1.0 releases of Perl 6 are now made on a routine monthly schedule.
This long gestation period has allowed Perl 6 to make many important refinements on the basis of early implementations.
The Rakudo Star release of Perl 6 on Parrot is due out in spring, 2010. This pre-1.0 release is intended to be practically usable by early Perl 6 developers.