In the form of a PECL extension. Currently min PHP 5.1.2, so no 5.3 bells.

Some current HN discussion can be found here

How does this impact the framework landscape for you?

Is this appearing just a bit too late?

Will it move from PECL to core (as many things have over the years? PEAR->PECL->Core)?

Had you seen this coming?

Are the comparisons made with ZF (on HN) fair?

Are you going to try it?