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This article describes Perl 6 and includes substantial background on Perl 5.
The de facto OO technique in Perl 5 is blessing a hash and accessing the hash's members directly as attributes. This is quick and easy, but it has encapsulation, substitutability, and namespace clashing problems. Those problems all have solutions: witness several competing CPAN modules that solve them.
Perl 6 instead provides opaque objects by default, with language support for creating classes and instances and declaring class and instance attributes. It also provides multiple ways to customize class and object behavior, from instantiation to destruction.
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