Well, folks, here it is, the official street date for D&D 4th edition. The next few months will be interesting, to say the least.
Over at WotC, there's surprisingly little to mark the occasion. I think there's a subtle change on the background of the web page, but I'm not willing to bet the farm on that. Maybe I just never noticed that blue-grey, carved stone look in the very back before? Entirely possible. They do have this handy little preview of things to come, promising D&D Insider in July.
UPDATE: Woops! Missed this: D&D Insider now has its own pages full of preview material and screenshots. If you've been curious what, exactly, the whole Insider thing is about and what comes with the service, now you can see for yourself.