Unless things have changed, Perl 5 work will be compatible with whatever eventually becomes Perl 6.

Someone would have to work on that seriously. A couple of proofs of concept have existed, but they tend to bitrot before they get anywhere close to complete.

Until someone shows you working code which solves non-trivial problems and demonstrates that said code will remain working for longer than a couple of releases, assume you won't be able to use Perl 5 code or the CPAN from a Perl 6 implementation any time soon.