We have the D&D Insider a source for "additional content" for "premium members" - so wizards could even make money out of this.
There are no new official adventures. (The contest seems to have faded unnoticed)
There are no villian cards for the new Beholder collectors set.
There is no new insider class or similar.
There are no new monster cards for D&D Minis (I admit that is very hard to balance and well wishing)
This puzzles me. Allthough the game is balanced quite ok, it is not as if the game doesn't involve any luck or is "perfectly balanced no matter which characters you choose and how many" - so the reason for not putting out new stuff shouldn't be balance issues.
As for additional villian cards for the beholders - I couldn't care less if they are well "balanced" or not - it's a single use adventure, so if one of them wouldn't work out perfect - whatever.
Having seen the tons of character options and monsters for D&D 4th I really would have hoped for some stuff for Ravenloft too