With claims / benchmarks like this I am sure you are right, particularly for a product that ships as much as WordPress does.

Wordpress 3.6 – 20.0% gain (253 vs 211 req/sec)

I have a few enterprise sites that I am constantly looking for ways to optimize for speed: DNS, CDNs etc. This looks like an easy win.

Looks like it will be 5.7 which is great! Just tested against our codebase, and it builds very quickly (maybe 15-20% increase in speed in unit tests) so very impressed!

Are you using a framework? Like ZF, etc?

Internally built framework. But we use external packages like AWS SDK (and so by extension Guzzle), Elastica, etc.

There are already PHP 6 books out there from 2009 (planned v6 renamed to 5.3): https://www.google.com/search?q=php+6&tbm=bks

They could name it PHP 7 to avoid further confusion.

PHP 6 was really about unicode support. It will actually create even confusion among veterans. Also, those PHP 6 books are really aimed at beginners.

In addition, skipping a version number also creates confusion. If they were going to go this route, they should have done it a long time ago (around 2010-2011).

http://www.slideshare.net/andreizm/the-good-the-bad-and-the-...

Yeah well... give it just a couple of more years and there will be kids born as Perl 6 was announced getting webdev jobs.