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About upgrade to PHP 5.4 engine #716
$this with closures should be all fixed by now, if not you should poke @ptarjan.
Coincidentally, he's also working on namespaces support and is coming fairly close. I expect we'll see support improve over the course of several commits this month.
As to a schedule of matching 5.4. We're not really focusing on version so much as catching up to HEAD (which is a moving target) and that's happening by feature/extension, rather than by version. "When" is based on impact, priority, and availability of resources.
Personally, I'd like to see us even with 5.5(ish) by year's end.