I'm not sure what the current patch is right now but I have a feeling that this is a patch update in the future.
http://us.starcraft2.com/launcher/patch-notes.htm?1
I'll just list the balance to make it easier
Balance
GENERAL
Players can no longer hide units by setting them in a close proximity patrol (ex: Viking flower).
PROTOSS
-Mothership
--Units leaving the Mothership's Vortex are now un-targetable and immune to damage for 1.5 seconds.
-High Templar
--Khaydarin Amulet upgrade (+25 starting energy) has been removed.
-Zealot
--Charging Zealots will now hit fleeing targets at least once.
TERRAN
-Battlecruiser
--Movement speed increased from 1.406 to 1.875.
-Bunker
--Build time increased from 35 to 40 seconds.
-Ghost
--EMP now drains up to 100 energy instead of all available energy. The effect on Protoss shields remains unchanged.
-Tech Lab
--Stimpack upgrade research time increased from 140 to 170 seconds.
ZERG
Infestor
-Fungal Growth
--Stun duration decreased from 8 to 4 seconds.
--Damage increased by +30% vs. armored units.