Jester David
Hero
My opinions on splatbooks, bloat, and sourcebooks are on record.For player mechanics, I also don't want a UA or PDF. Instead... I want to see the new WotC "Big Book Of Mechanics" or "Player's Handbook II" or whatever you want to call it that they apparently are working on or thinking of working on... to include the required mechanics (races, classes, subclasses, backgrounds etc.) for ALL of their primary campaign settings.
That means psionics, that means the four Eberron races and the Artificer, that means Dark Sun's races plus defiling and preserving, that means Dragonlance's three wizard schools, that means Greyhawk's backgrounds, that means Planescape's factions, that means stuff for Mystara and Birthright... etc. etc. etc.
But that's still a solid idea. Instead of 5+ campaign sourcebooks, just to all the most essential stuff in one place. Give everyone the one product.
That's probably the best idea for a splatbook I've every heard.