Re:Just rename it. (Score 1, Insightful)

Yikes, don't do that. I think its easier to determine which version is newer or older based on the version number associated with it. Who cares about "new" versus "old"? All I care about is whether my/other code will work on a particular interpreter. And figuring that out is harder if interpreter names aren't tied to major language changes. Perl 6 has the advantage of being backwards compatible with Perl 5, despite many changes to the language.