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Kohana isn't a CI rewrite since 3.0.0. And yeah, Kohana 3.3 will natively use 5.3 goodies.

I've yet to see any indication that it will use PHP5.3 in an idiomatic way. It still seems like a bolt-on.

(I still wouldn't use it because frankly, I don't think the Kohana developers take security seriously enough, but it'd be a start.)