one more protoss unit and building

Again, the info is from www.starcraft2.com

unit:

Phoenix:
the phoenix is a swift and deadly spacecraft that is rapidly replacing the older scouts and corsairs in the role of fighter for the protoss. Phoenix patrols are a common sight on the outer rim of protoss territory, where they sweep deep space for alien threats. The twin ion blaster armament of a phoenix is highly suited to air-to-air combat and can also be used for strafing light ground targets.

Building:

Stargate:
The warships of the protoss fleet require a much stronger warp link in order to materialize than a standard gateway can provide. The immense stargate is capable of calling ships from high orbit or across immense distances to appear on a planet surface. The construction of one or more stargates at a protoss base is a sure sign that it has become a major staging point for an offensive. This excerpt from the after-action report of Flight Sergeant Aaron Keebler helps underline the rapidity with which the protoss can switch their stance.