Massive changes in HotS patch #11

The latest patch for Heart of the Swarm beta is bringing along some truly bold changes, including the removal of Vortex and Siege Tanks having Siege Mode researched by default.

Overall, terrans seem to be getting the most attention and it doesn't stop with removing the necessity to upgrade Siege Tech. Further tunings include Reapers not requiring tech lab (though having two of their abilities removed from the game) and Seeker Missile cost decreased at the expense of its damage.

Apart from the removal of Vortex, the protoss only has some abilities moved over to other new units, while zergs' only real change is a nerf to Fungal Growth's damage.

Terran

Barracks
Train Reaper no longer requires a Tech Lab Addon.

Hellbat
Attack speed changed from 1.9 to 2.
The Infernal Pre-Igniter upgrade no longer increases Hellbat weapon damage.
Napalm Spray weapon damage increased from 10 +9 vs. light to 18 +12 vs. light.
Splash damage radius decreased from 110 to 45.

Medivac
Caduceus Reactor
No longer improves the healing rate of Medivacs.
Upgrade cost decreased from 150/150 and 110 seconds to 100/100 and 80 seconds.
Emergency Thrusters ability renamed Ignite Afterburners.

Raven
Seeker missile
Energy cost decreased from 125 to 75.
Primary target damage reverted from 300 to 100.
Seeker Missile once again deals splash damage.
The delay time prior to firing has been increased from 3 to 5 seconds.

Reaper
The Battlefield Awareness passive ability has been removed from the game.
Movement speed increased from 3.38 to 3.75.
The Nitro Packs upgrade has been removed from the game.
P-45 Gauss Pistol weapon damage decreased from 4 +5 vs. Light to 4.

Siege Tank
Siege Tanks no longer require an upgrade in order to enter Siege Mode.


Protoss

Mothership
The Vortex ability has been removed from the game.

Mothership Core
The Envision ability has been moved to Oracle.

Oracle
The Time Warp ability has been moved to the Mothership Core and the Mothership.


Zerg

Infestor
Fungal Growth damage decreased from 30 +10 vs. Armored to 30.

Mutalisk
Mutalisk Regeneration passive ability renamed Tissue Regeneration and its tooltip has been updated to improve clarity.

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David Kim's thoughts on why such changes needed to be made can be read here.

Source: Battle.net