This version contains new features and bug fixes. Most importantly, it contains a new module "mmsequence" (contributed by Pavel Levshin) which permits action load balancing. Also, variable access has been totally refactored and its processing speed improved. Note that this refactoring has some additional bug potential, so watch your system closely after the upgrade. Support for global variables has been removed, as the idea did not work out properly with the current core engine version and resulted in very unintuitive results (most folks would them simply call "wrong"…).
More detailed information is available in the changelog.
As always, feedback is appreciated.