At the time of writing, both the North American, and European servers seem to be down, so they could very well be installing the patch as we speak.
Patch 15 Notes:
General
* Improved the system that handles initial placement and promotion/relegation between Leagues & Ladders.
Balance Changes
* TERRAN
o Hellion
+ Weapon upgrade bonus decreased from 1 (+1 Light) to 1.
o Reaper
+ Nitro Packs research cost decreased from 100/100 to 50/50.
o Siege Tank
+ Siege Mode damage decreased from 60 to 50.
o Thor
+ Anti-air weapon upgrade bonus decreased from 1 (+1 Light) to 1.
* ZERG
o Brood Lord
+ Weapon upgrade bonus decreased from 3 to 2.
* Improved the system that handles initial placement and promotion/relegation between Leagues & Ladders.
Balance Changes
* TERRAN
o Hellion
+ Weapon upgrade bonus decreased from 1 (+1 Light) to 1.
o Reaper
+ Nitro Packs research cost decreased from 100/100 to 50/50.
o Siege Tank
+ Siege Mode damage decreased from 60 to 50.
o Thor
+ Anti-air weapon upgrade bonus decreased from 1 (+1 Light) to 1.
* ZERG
o Brood Lord
+ Weapon upgrade bonus decreased from 3 to 2.
Hopefully they will release more details on how the placement/promotion system is improved, since that seems to be very interesting. It may show up in the regular accompanying "Situation Report" which has not yet been released; however be sure to check back, as we will update you as soon as it is released.
Links
Battle.net - Patch 15 Notes
