UPDATE 6/5/14: It's BOGO day at Star Wars Assault Team! Special Mission costs were reduced to 4 Energies across the board and the Win New Heroes special missions are here for you to win Shistavanens and Anzats (I guess Anzat is the noun and Anzati is the adjective for these guys). See below for YouTube gameplay videos and screen shots.
All 3 Missions on Normal Difficulty
All 3 Missions on Heroic Difficulty
All 3 Missions on Epic Difficulty
When the Night Comes
Normal Difficulty (1st time)
Normal Difficulty (2nd time)
Chase the Kidnappers
Must use Shistavanen
This is what a Tier 5 Anzat looks like as your opponent
UPDATE 5/31/14: I encountered a Shistavanen as a helper on a mission:
Shahid Altaf also found these screenshots, taken by dexilus on appinvasion:
So this is what Shistavanen looks like at Tier 4, Tier 5, on your mission team and as your opponent.
======== Previous Post ==========The proof, without actually seeing them, is in the Promotion Items. Several of them have been modified and a few new ones have been added. Take a look at some of the items below, or refer to the Character Promotion Reference page for full details as they become available.