Moon Phase reports that the eight episode of the Melancholy of Haruhi Suzumiya re-airing, which (some) fans have long held out hope would have new episodes mixed in with it, is actually going to be a new episoe. Specifically, the episode is called “Bamboo Leaf Rhapsody,” a story from the third novel that launches directly into to some of the larger over-arching plot of the novel series.
So, I guess that answers that question. The new episode will be airing on May 24th. Those of you who are familiar with the story, DON'T SPOIL IT HERE! I've established a discussion thread where you can talk about how you want (or don't want) the story to be handled in the anime version.
We'll leave the comments here spoiler-free for those who want to express astonishment that there really is new Haruhi going down.