WotLK

WotLK MoP Legion

Tested 05.02 by Rossweisse and Aerall. DK/Hunter/Paladin/Boomkin + Shaman/Paladin/Priest on NM/HC, Alliance side
Re-tested 11.02 by Rossweisse and Lustabtang. DK/Pala + Priest

How it works:

Both, small and big ooze can be grabbed, slowed, snared,feared, knockback and everything else.
Unstable explosion droplets target only one person
When two big oozes merges together one of them disappear and they don’t even stack their buffs (1 stack + 1 stack = like they just merged)
Big ooze explosion (unstable explosion) can be interrupted
Big ooze with 1 stacks + big ooze with 4 stacks = big ooze with 2 stacks (chat on 1st screenshot)
Unstable explosion can be interrupted
There’re 2 mutated plague applied on 10m encounter (and it’s applied slower further in fight
Mutated plague can be casted on two players same time
Small oozes doesn’t spew puddles

How should it work:

Only small ooze can be slowed/grabbed but should be unable for crowd controll,
Unstable explosion should target a few targets during the run, no matter how many, some sources say it should be everyone. At least, more than 1 (tested with 6 players - he targeted only one still)
Big + Big = Big x2
Big + Small = Big + Unstable Ooze
Small + Small = Big
Unstable explosion shouldn’t be interrupted
Mutated plague shouldn’t be casted at 2 targets at once
Mutated plague should be applied from slower to faster not reverse as it is
Small oozes doesn’t spew puddles like big ones

Sources:
MMO - 5th comment

We still have to check healing debuff - wasn’t focused on it before (check mutated infection section)