So, as you probably know, Larry Wall announced the alias 'Raku' for Perl 6.
This alias does *not* (and indeed cannot) free up the version number 6 for the Perl 5 language. If you think about it carefully, you will understand why that is the case. "Perl 6" (P6, etc) is already in use and essentially remains that way.
It is my considered opinion that Perl 6 will never supplant Perl 5, and vice versa. I'm hardly the only person who has come to that conclusion. Therefore, the alias idea makes sense. It's time to work on getting the version number out of the everyday names of the languages. The ideas I keep seeing floated that the new Perl 6 alias means Perl 5 now gets to "move up" to Perl 6 or revert to being "the only Perl" are not helpful. Personally, I'd like to see Mr Wall give Perl 5 its own alias. Two Perls, جمل * and Raku. :-)
* That's camel in Arabic and I'm kidding about that one