I’ve heard of Raku (Perl 6), but didn’t realize there was a Perl 7 or Perl 11. Pretty interesting problem. In Java land you get Java 8, current Java, Groovy, Kotlin, etc. So Perl is in good company in this regard.
Perl 11 was a thought experiment. It never actually became anything beyond a website expressing that notion. It got no traction from anybody apart of the originators. And of that I'm not really sure either.