Largely would be enough. I mean if things that HAVE TO change changed and new things were added, I would happily call the result the next version of Perl. But that's not what happened with Perl 6. Things that should have been left alone were changed just for the sake of change (-> to . ? . to ... what the heck is that? _? ~?); the sigils were totaly rewamped not in what they look like, but what they MEAN ...

Nope, I would not call Perl 6 the next version of Perl. With or without the 5. I would call it a language vaguely similar, yet dangerously different. A language full of false friends and a language that went overboard with special characters. An overdesigned, overcomplicated language.