Blizzard has stated on forums that the super cc splash is unintentional. Sure makes repairing SCVs much less of a bother though :0
Looks like they fixed the Ultralisk bug along with the 7% mineral increase bug.Link.
"fixing" the ultralisk bug involved nerfing them to oblivion.
I play random so yes I play zerg 33% of the time. I will admit that statement is exaggerated, but it is that way for a reason.