My two cents:
1) Big fan of 4e (huge!), as it's playable by my group, and allows the DM to have a life. I've managed to get a Classic feel to my games with it. I like the PH2, Martial Power, and am looking forward to other books. This is, for me, the best edition I've seen. R&D did a great job. Keep this edition going, please.
2) I really like DDI, and more options there would be nice. A Module Formatting tool, to take encounters and monsters I make or get from the compendium, and make a file out of them, is I think the direction I'd like to see.
Online tools and PDFs are key. I do like (love) print books, but can't always carry them with me.
3) I don't like the flippant management of company-public relations. The PDF debacle was rude. The way Paizo was "just fired" was rude, or it seemed to me that way. The hard magazines were a tradition, not just a product. That DDI is a great product has no bearing on this. Saying goodbye to Dragon and Dungeon on a whim, as if the public's opinion didn't matter, that was a bad move... I mean, why is Paizo the competition now? That one stupid move.
We want to love you guys. Please help us feel like necessary decisions (like "we can't afford the magazine in paper and it kills trees") can be done. Let us feel that we're not "beneath your respect" with these moves. Try to accomodate us, we're paying for stuff. It's not the same as a TV network: the community is all about interaction; manners will help so many of the recent problems.
4) GSL/OGL/Fansites and participation: Figure a way to get the players interested in the game, that's the DMs job, that's what you're selling. Now expand that. Not just RPGA. We tend to be counter-cultural. Suspicious of ...well, name it. That's why we create an interior world.
Your job is to nurture the market, and that means the community. I like 4e. Now let me write for you. Let me post my adventures. I get the quality control, perhaps, and other companies have had it (M&M does it for their brand).
I get the market share, but this product isn't like other products. It's an amazing one, but it's all about people. Why would you alienate your stockholders? Why would you alienate your co-workers?
Granted, I didn't like all the OGL stuff that came out. Also, a lot of cool monsters weren't in it, and that sucks. I want to do a 4e campaign setting some day, but what if I can't use Genasi or Drow?
suggestions:
1) access to a shared history isn't bad; don't lose your own foundation, right?
2) more DDI tools; I'm subscribed, beef it up!
3) I like the design changes, but sneaking them in isn't necessary.
4) More stuff in the GSL, like if I want to write a setting with my own version of Illithids and Beholders; Or if I want to publish a set of D&D 4e inspired novels!