Things I'd like to see:
-I actually like the preview articles. I would love to see the setting-neutral Themes go up in the next month or two like Skill Powers did. Ditto for the non-combat stuff.
-Longer, more substantive articles rather than short ones. I don't need the dopamine drip of daily updates. Give me something meaty.
-Setting-specific stuff. There's too much ink spilled on the core world and on stuff that's meant to be useful regardless of setting. This contributes to the flavorlessness of different places. I'd rather have an article for a setting I don't use that makes me want to run a one-shot or mini-campaign in it than a throwaway bit of "flavor" that's about half a session's worth filler for a generic campaign.
-I thoroughly enjoyed the annotated articles with design decisions explained.
-In Dungeon, I'd like to see the Encounters adventures get reworked into full-blown modules. Not all of us can make it to those but would like to see stuff like Undermountain.
-More solo adventures! That's something I can get use out of regardless of my current game.
What I don't want is stuff that clutters my Character Builder. That is, I've got all the feats and magic items I could want. For most classes I've got all the (combat-related) powers I want. You're just increase the cost to me of searching for an appropriate option at this point. Increase the number of options you must, but look for areas where there are:
A) Fewer existing options
or
B) Less frequent decisions
(There's plenty overlap between the two.)
A is things like new class builds or variant class features. Or even classes. The Assassin was great.
B is stuff like Paragon Paths and Epic Destinies. There are lots of PP's out there, but I only have to choose between them once. Most can be sifted through quickly since they are fairly specific. They also have built-in flavor material. So I'd rather have 1 new paragon path than 20 new powers. Even setting-specific ones, since we're not seeing new books for existing settings. And for the love of Tempus, give me good iconic Monk and Avenger PP's.