Well I don't know what they're going to do but I can tell you what I'd do:
1. All mobs are immune to cc
2. Zorn and Toth will randomly become untauntable during the fight
3. The shields that drop during F&B will move during the shield phase forcing you to fight on the run.
4. The Probe Droid overload and cleave are now .5 seconds faster (rather than adding in a 3rd thing to interrupt).
5. Colonel Vorgath will randomly leap to whoever has the lowest threat.
7. The 3 droids from the Kephess fight will use an ability that makes them resistant to damage (8 stacks = unkillable).
8. The bomb walkers will use a knockback at 50% health.
6. Kephess will slow anyone he hits with a non-cleansable debuff and will stun whoever has the highest thread at 20% and 10% health.
Now that's what I'm hope for