The Drupal 7.15 release blockers mentioned last month have all been resolved (thanks to everyone who helped!), so a new release of Drupal 7 is now scheduled for this Wednesday.
The final patches for 7.15 have been committed and the code is frozen (excluding documentation fixes and fixes for any regressions that may be found in the next couple days). So, now is a wonderful time to update your development/staging servers to the latest 7.x code and help us catch any regressions in advance.
The relevant change records for Drupal 7.15 are listed below (thanks to Robin Millette for compiling this list). This is not the full list of changes, rather only a list of notable API additions and data structure changes that might affect a number of other modules, so it's a good place to start looking for any problems:
- DANGEROUS_ACCESS_CHECK_OPT_OUT query tag added to EntityFieldQuery
- Entities now have generic language support
- Field forms are built with the same structure regardless of whether or not form_access() = TRUE.
If you do find any regressions, please report them in the issue queue.