Don't make the mistake to confuse Parrot (a general purpose virtual machine, designed for dynamic programming languages) with Perl 6 (a language specification with multiple, incomplete implementations) or with Rakudo (a Perl 6 compiler that compiles to parrot byte code, and lives the parrot repository).

I think that the time line for parrot is quite realistic, although I wouldn't place a bet on the exact dates.

For Perl 6 and Rakudo it's much harder to say, because some parts of the language aren't all that well specified (for example concurrency), so nobody can tell how much effort both specification and implementation will be.