What Diddly said... HK's incredibly entertaining in KOTOR, but I could see them slipping him into a prequal (less protocol droids to pick from it seems) or EU wave. U-3PO suits me fine. HK's a really cool droid in the game though, for sure, and probably one of the more funny/entertaining characters in all of Star Wars if for no other reason than he calls humans "meatbags" constantly.
I'm almost skeptical they'd make him a BAD figure though too... Unless they confirmed it in a Q&A? He seems popular enough from KOTOR to get a carded figure, not essentially a "free" figure.