An amazing game play video with some more information on the upcoming Protoss units. This is a better quality than the ones found down at YouTube and we hope Blizzard will upload an HD version to Starcraft2.com soon!
Words fail us but here’s the essence of it:
1) Soul Hunter - his attacks get stronger the more units he destroys.
2) Phase Canon - these can now be moved around the base.
3) Mass Tempests (previously known as Carriers) - now feature a shield that protects them from ground attacks. They’ll also cost less.
4) Twilight Archon - powerful infantry unit - not that much different from its previous incarnation

