PROTOSS
Cybernetics Core
Warp Gate research time increased from 60 seconds to 140 seconds.

ZERG
Hatchery/Lair/Hive
Burrow research time increased from 50 seconds to 100 seconds.
Burrow research cost increased from 50 Minerals and 50 Vespene Gas to 100 Minerals and 100 Vespene Gas.
Nydus Network
Nydus Worm build time increased from 10 seconds to 20 seconds.
Hydralisk
The delay between attacks has been increased from 0.75 seconds to 0.83 seconds.
Infestor
Neural Parasite has been redesigned:
The limited duration of 10 seconds has been removed.
Can no longer target air units.
Cast range decreased from 9 to 7.
Burrowed Infestor move speed decreased from 1.5 to 1.
Infestor life decreased from 120 to 90.
Infestors that are burrowed now have the same threat level as above-ground units for the purposes of automatically acquiring targets.

Bug Fixes

Fixed an issue with High graphics settings that could cause particles not to render.

Protoss received another nerf but for good since Protoss vs Protoss is heavily imbalanced in favour for 3 warpgate zealots strategy. Even a base with 3 gateways cannot keep up in production to a 3 gate warpgate. The Hydra attack cooldown will certainly help for PvZ and TvZ since Hydras in high quantities are dangerously strong. With the previous change of the infestor, it was turning battles towards Zerg side very easily and the nerf was for the better. The longer build time for Nydus would allow the opponent to react faster and defend accordingly in time.

In short, Zerg got a general nerf while for Protoss, the nerf was specified to fix the PvP warpgate issue which doesn't really affect the other race matchups. No changes for Terrans as of yet but we might see somemore changes to Zerg.