Given that he's currently... indisposed... Being in another dimension and brainwashed at the moment, he probably hasn't had the time or opportunity to sit down and hack into SHIELD to locate his estranged father's latest whereabouts.
How will Skaar react to the return of Savage Hulk?
Is the Hulk in Indestructible Savage? I though the just hadn't been given the opportunity to speak.
Regardless, Skaar's reaction will probably be the same as when he first met Savage Hulk, "WHO ARE YOU AND WHAT HAVE YOU DONE WITH MY FATHER YOU MINDLESS ABOMINATION?!" Granted, that was a bit verbose for Skaar. Think all of that, but spoken in sword.