A DM book dedicated to Fey and the Feywild!
I mean we've gotten Plane Below, the Plane Above, and the Shadowfell book (not to mention an Underdark book). We've gotten a book of Demons, Undead, and
two Dragon books.
Why has there
not been a book on the Fey/Feywild? I want to see a book on them. Furthermore I want to see stuff on Fey psychology. Skill challenges on trying to resolve something (like escaping the party that entrances you to dance forever, or to defeat a fey by having a musical instrument contest). Not to mention bargains/boons you can get.
And then there's the Feywild itself. It's pretty new as far as planes go in D&D, so it should have been one of the first ones explored.
Rules for objective encounters
This was touched on in the DMG2. But I would enjoy seeing rules for various objective-based scenarios.
This thread has great ideas, but designing them is
tough.
Builds
There are two new builds I would enjoy seeing. One is for the Avenger: a ranged, magic-using avenger. Mechanically like single-target divine Warlocks/Wisdom-focused clerics; their role is to unload striker effects with harsh ranged divine magic. Call them the Exorcists or something.
The second would work for a druid or a Wizard: a class that is all about changing the battlefield. Creating walls, higher ground, pits, etc. Furthermore the effects they create could be of varying intensity - creating a wall that can move around. The idea being that while Wizards (and other spellcasters) hit hard, these guys are more like wrestlers.