I'm gonna agree with more horror figures, too. A cryptkeeper from HBO's Tale from the crypt series would be fun. Universal monsters are needed, but I'd like to see them do a Christopher Lee's Dracula.
I really want more artist/comic based figures, but Mezco has said that they're aim is for more of a "realistic" look with the comic characters, which isn't my favorite choice.
I really want a whole Batfamily, as played out as that may be. More of a pre-new52 centered version, but with some things before and after. A classic style batman with a yellow oval, blue cowl, long ears, and a capsule belt, like Neal adams drew, would be great. But so would a Jim Lee Hush style one. A classic Babs Batgirl, but also Steph and Cass versions. Nightwing is another must, and I heard there's some talk about it already. Unfortunately, they vetoed Robin since they don't think it fits the "real world" idea, which is a shame. I wanted a damian, or a classic Dick Grayson.
And more independent comic stuff too. I'd love a Big Head/The Mask, based off his comic look from the first mini, with the leather jacket. Grendel, Madman, Nexus, etc, but I fear how those would sell.
Eventually, I'd like to see video game figures, but not necessarily taking priority over the comics stuff. Mainly things like Castlevania or Metal Gear(but I doubt Konami would play ball). And maybe musician based figures. I think it'd be cool to see some artists' stage outfits done in the line, though I'm not sure how many people would be interested. But think of a david Bowie as Ziggy stardust figure, or Prince in his 80's Purple rain outfit, The Beatles in their classicsuits, or a Michael Jackson figure from Thriller than comes with alternate zombie and werecats heads.