The first release candidates of 5.2.15 and 5.3.4 were just released for testing and can be downloaded here:
http://downloads.php.net/ilia/php-5.2.15RC1.tar.bz2 (md5sum: 9b2c632427a533fdb3946081c7c382c2)
http://downloads.php.net/johannes/php-5.3.4RC1.tar.bz2 (md5sum: 2edb695f94ef41cc9cfa35777b2656ec)
This is the first step in the release process of both versions and goal is, depending on feedback, having a 2nd RC two weeks from now. We aim at having final releases around mid December. Majority of the changes for both versions are of the "bug fix" variety. To ensure that the release is solid, please test this RC against your code base and report any problems that you encounter. Please also note that 5.2.15 is supposed to be the final release from that series.