If it's like totally a new language, it should be called TotallyNewython 1.0
AlmostTotallyNewthon would be better, correct. Would shift discussion from 'upgrade' to 'migration' without all the usual cries. Other than that it's understandable that some architecture decisions from 1991 haven't aged well.
I think “Perl 6” was already taken, so they couldn’t use that :-)