Ovid and davido won't claim to know what will happen to PerlMonks as Perl6 takes off. I claim we'll see more mentions of "perl6" and "parrot" in titles and eventually see more mentions of "perl5" in titles and "perl6" will eventually become "the default" assumption.
I proposed nearly this in Re^2: How to let visitors know which Perl version we're talking about (muddy) but I prefer the obvious but still short labels like "perl6" over the previously proposed conventions like "(p6)" (which would never get used consistently enough).
That node also goes into why I don't think a new section or other metadata should be invented to try to segregate "perl6" from the other two closely related and often overlapping subjects.