According to this thread on ENWorld, an article in the latest Dungeon Magazine (loose definition of magazine, but whatever) talks about adapting a 3E adventure, "The Lich Queen's Beloved" not just to 4E, but to AD&D 1E and 2E.
Much as I'd like to think this will be an ongoing theme, I doubt it. I can't vouch for the article itself, as I have no intention of paying 10 bucks for the privilege of reading the single article I might be interested in.
Still, I find it interesting that they would even consider publishing an article dealing with anything other then the rule system they are currently publishing. Would have made more sense to have this article available to non-paying subscribers, to bring those that might not normally check out the whole DDI thing to the WotC site.
Eh, time will tell.
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