The latest patch notes can always be found here.
StarCraft II Beta – Patch 5 (version 0.7.0.14356)
o Cybernetics Core
+ Warp Gate research time increased from 60 seconds to 140 seconds.
+ 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.
o Nydus Network
+ Nydus Worm build time increased from 10 seconds to 20 seconds.
+ The delay between attacks has been increased from 0.75 seconds to 0.83 seconds.
+ 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.
* Fixed an issue with High graphics settings that could cause particles not to render.