I'm sure krakens/lagoon creatures are on the short list. They'll probably come with frog heads or something so they can sell them as Deep Ones, but they'll have alternate heads to recreate the Palitoy figure for sure.
I rapid-fired my wishlist a while back, but aside from Mr. Hyde, I can't think of any more "classic" classic monsters for the line. Not counting alternate presentations of things we already have, like mummies and vampires.
But if we expand our idea of "classic" to include some 50s icons, then I definitely want to see a Human Fly scientist. I also really want some Vincent Price representation and figure a House of Wax-style melty man shape-shifter would look awesome (and give a reason why his alternate head looks like the famous actor).
I don't know a lot about non-European horror characters, but think it's worth exploring. Fer instance, I would snatch up a luchador hero who allied with O:MF to stop his ancient foe, an Aztec mummy.
I wish I could get excited about 13 Ghosts. So far they're either just guys in suits with interesting half-masks, or a full-on samurai guy with a full oni mask. I think I'd prefer a middle ground of regular guy with full oni mask. Hard to say, but it still feels like one doesn't go far enough while the other goes too far.