My favourites:

• the entire new regexp system, which will allow us to write grammars directly in the language,
• the type system, which will most likely allow us to reduce the amount of memory used by Perl when needed,
• wrappers around subroutines (along with temporization), will make testing much easier, it will be possible to write stubs for existing functions,
• "cute" feature I like the most: the "pipe operator" (==> and <==),
• and of course Parrot is great idea, I want to be able to use the best ruby/python/brainfuck libraries (OK, maybe not brainfuck ;--)

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