yes i found it on the wikii starcraft when i was searching on many info about the stank and the omegakisk i found :

Gigalisk
Magnathar

and they says we will see it on hots camping so what i think if zergling can be rapter or swarmling ultralisk can be gigalisk and maybe its a big virsion of the real ultralisk
and the magnathar maybe had the charg burwoo !!!!!!

thats what i think hope u guys share me yours