Leon Timmermans has a nice look at Why Perl 6 is different.
Perl 6, like Perl 5, Ruby and Python steals a lot from other languages. As you may expect, it steals too many things to mention from Perl 5. It steals chained comparisons from Python, objects from Smalltalk (in particular Squeak's traits should be mentioned). It thankfully steals nothing from PHP.
Not to split hairs of course, but Perl 6 still isn't out, so it can be the most awesome thing since sliced bread, but if no one uses it....