Right now, I don't need or really want much for new crunch. I got plenty, thanks.
What I would most like to see right now is serious expansion, revision, and evolution of existing game mechanics. WotC has basically spent the last three years carpet-bombing us with new races, base classes, spells, and feats. Some of this stuff was out-and-out terrible, some of it was clearly spectacular, but a lot of it, I just don't know. Is the warlock class a worthy addition to my game? How about the duskblade? I have neither the time nor the inclination to test all of this by myself.
It seems like WotC has somewhat painted itself in a corner with all this new non-core material. If they are writing a new book, they have a painful choice -- do they support the non-core material, and if so, how much space do they devote to it? Any choice is going to tick people off. People who use the new material will be ticked off that they aren't supported (why couldn't they have included some new warlock incantations? Waaaah!) People who don't use the non-core material will be ticked off because there's support for materials they don't use (why is all this space being wasted on some stupid wu-jen class I've never heard of? Waaaah!)
I would really like to see WotC add a lot of these new non-core mechanics to the SRD so third-party publishers can produce supporting material. Maybe this would even draw some publishers back into d29 fantasy.
Anyway, what I would really like to see over the next couple years would be to have WotC and 3rd party publishers cull through the huge mass of new material. Let evolution select the best adapted races, classes, feats, and spells.