To be more exact, I'd love to know the release schedules for SF and Fantasy publishers (and maybe paranormal romance and YA...): Ace, Roc, DAW, Tor, Baen, Kensington, Warner, Orbot, Solaris, etc.
Even if no such thing exists, I might be convinced to create such a resource if I can piece together the bits needed.
(I know some publishers do list their upcoming releases, but I just wanted to find if there was a central database, for my own curiosity.)
Anyway, that's my random thought for the moment.