A cover and an announcement for Dungeon Fantasy Companion, by Sean Punch, was put up on Kickstarter.
Here is what I'm speculating will go in it:
- leftover magic items that didn't fit into Magic Items 2 thanks to not making the extra page count.
- new templates for player character professions
- new templates for player character races
- possibly more "power up" style additions to existing templates.
It would be a good place for new rules, but DFRPG isn't rules-heavy. Monsters, too - it could possibly include monsters left out of Monsters 2 (but for various reasons I suspect they'd get saved for Monsters 3.)
That's what I mostly think will be included.