The current stable upstream version at the time of this writing is 5.6.0.
There is currently work in progress on the next major revision, although the
specifications have yet to be finalised.
It is anticipated that when Perl 6 is released it will initially be packaged as
perl6, install the binary as /usr/bin/perl6 and use
different directories for packaged modules to perl:
/usr/lib/perl6
/usr/share/perl6
This will allow Perl 5 and 6 packages and modules (which should be packaged as
libfoo-bar-perl6), to co-exist for as long as required.
At some stage in the future when Perl 6 is sufficiently mature, the package
naming may be reversed such that the perl package contains Perl 6
and the current package becomes perl5.