WordPress 3.4 had a very good release with more than 3 millions downloads in two weeks only.
This release addresses many bugs including:
Fixes an issue where a theme’s page templates were sometimes not detected.
Addresses problems with some category permalink structures.
Adds early support for uploading images on iOS 6 devices.
Allows for a technique commonly used by plugins to detect a network-wide activation.
Better compatibility with servers running certain versions of PHP (5.2.4, 5.4) or with uncommon setups (safe mode, open_basedir), which had caused warnings or in some cases prevented emails from being sent.
New version of WordPress have been release as WordPress 3.4.1, that is now available for download.This version fixes few security issues such as: potential information disclosure and bug that affects multisite installs with untrusted users.