Planar Campaign Setting: Oathbound almost makes it but it's isolated and the character don't really go out of the setting. This would incorporate the various methods of travel that Mike introduced in Portals & Planes and expand them greatly. It would feature some heavy psionic action as well but that would be something modular that the GM could use or not use as she choose.
D20 Modern Military: A d20 modern game with a heavy focus on the military. While the makers of Fading Suns have done some interesting books, it's not d20 modern.
Big Monster Book With Good Art: While the Monsternomicon and Liber had some great art, Sword & Sorcery Studios seems to have gone out of the way to make numerous big books (Tome of Horrors, Creature Collection, Creature Collection Revised, Denizens of Darkness) with some really bad art. Some of the older monster books like Nightmares & Dreams, had good ideas, poor art (and are in need of 3.5 revision!)
Path of the Psion: Similiar to the various Path books by FFG with a focus on psions and psychic warriors with some alternative core classes, legendary PrCs, feats, psionic magic items and other goods. Another field left blank by WoTC various splatbooks in the vein of sword & Fist.
Kane/Immortals The players take the role of evil immortals and try to take over the world. Would have ideas for using NPCs in groups for long term opposition, rules for covering years of time span, material for running an 'evil' character. (Evil isn't killing children, it's taking over the world!)
Beyond Hack & Slash Updating the articles from old Shadis/Knights of the Dinner Table, where you get experience points for various actions that don't involve combat. This would range from doing missions for your mentors, casting spells for spellcasters, bonuses for hit dice for creatures overcame for fighters, etc... Same 32 page book.
Way of the Drenai Epic fighters and legendary assassins work to overcome incompetent politics and devistating treachery at the hands of those they love. Based on David Gemmels novels with a comprehensive timeline, maps, major stats for characters, bestiary, adventure seeds, two sample adventures. 260 b & w pages. (Hey, if they can make books on R. A. Salvatore's mediocre Demon Wars... I can dream...)
Other Licenses Some of these would be to pull together variant material and make a definitive book on the subject like a low magic, high powered campaign featuring the Black Company while others would be updating the Classics via Thieves World and some would be for mature adventurers like Lankhmar. Some could be working on Epic Scale using multiple characters in a character tree similiar to Dark Sun via the whole Eternal Champion theme where the characters move from plane to plane to plane in epic meta campaigning.
Well, that's about it for now.
