Found this on the WOTC website. Have there been any debut material released before these articles for PHB3?
Player's Handbook 3 Debut Content
We recently announced that debut content was coming to D&D Insider. As a D&D Insider, you're going to start receiving fully developed and edited, ready-to-publish material from key 2010 titles way ahead of their official publication dates. This isn't playtest material. It isn't half-finished, partially formed, sneak peeks. Nope. It's just like what appears in every physical product we produce. What's the difference? The difference is that, because you're a D&D Insider, we want you to be able to start playing with this material right now. That's the same kind of access to new stuff that we get here in R&D. What could be more Insider than that?
This debut content, which becomes available on D&D Insider up to a year before it sees physical publication, populates the D&D Character Builder and the D&D Compendium, making it immediately useful in play. That's huge. We're starting out by debuting key material from next year's biggest physical product, Player's Handbook 3. As a D&D Insider, you're going to get to start playing with the psionic power source way earlier than the rest of the D&D gaming world. In July, the psion player character class debuts, complete and fully loaded in theD&D Character Builder so you can dive right in and start making psion characters for your next game session.
Starting in July and continuing each month until the release of the physical book next March, we'll roll out distinct and complete chunks of the book. By the time the book sees print, D&D Insiders will have gotten over 100 pages of material early. That's about 50 percent of the book. You're going to see one build from up to five new classes, a few new races, feats, and other surprises from Player's Handbook 3. And that's only the beginning. Later this summer, we'll start rolling out debut content from a second key 2010 title, continually building and expanding the program as the year progresses. This is exciting stuff, and almost instant gratification for the creative teams here at D&D R&D. After all, in the Old Days, stuff we worked on wouldn't see the light of day for months if not years after we finished working on it. Now, for this debut content, that delay will be much, much less.