The 12th update to Starcraft II's beta has been released with just a handful of small but important tweaks. Each of the three races got a couple of changes, including the much talked-about alteration to the terran's thor. The huge mech unit will be less huge from now on, making it a lot more maneuverable and a more viable unit choice.

Protoss got a slight nerf to their fast expansion strategy via some changes to the forge. Reducing the building's HP and shields to 400/400 is not a huge deal. But increasing the build time from 35 to 45 seconds could prove fatal to the fast expansion on some maps. Protoss' mothership did get a bit of a buff, allowing it to remove force fields with its Vortex ability.

Like terran, Zerg only got one change but it is a very significant one. One of the most important units so far in the beta, the roach, has been nerfed in an interesting way. Its stats remain exactly the same, but it will now require two food instead of one, making it harder to mass.

Additionally, patch 12 should fix the bug that was making crashes happen when exiting the game. You can read all the patch notes, including those from previous patches here.