Of note is that Perl6 the language and perl6 the interpreter are being developed separately. Right now, the language spec isn't anywhere near complete, and I don't think you can truely make any sort of schedule for that kind of thing. Also note that not even the Perl5 language spec is done. Given that the perl6 interpreter can and will be developed in parallel with the Perl6 langspec, I'd say schedules will be available once the langspec is considered sufficiently complete to attempt an actual implementation; and I'd also say that once we reach that point, the implementation will be with us much sooner than you probably imagine.
Makeshifts last the longest.