Original descriptions for legacy reference:
Immune To Enemy Ultimates: 55-70% chance
Do Extra Damage: 13-33% chance to do 3-13 damage
Blind The Enemy: 5-20% chance to blind
Black Hole: 20-28% chance for 2-4sec
Is this ultimate also supposed to push people instead of pulling them on occasion?
It's supposed to push teammates from the singularity point, and pull enemies into the singularity.
If that's what it's supposed to do, then it doesn't do that either. I get pushed from enemy holes more often than friendly holes, and I've missed many an enemy kill from them going away instead of toward.