I didn't see it mentioned in this thread, but in the last two weeks the people at Tough Pigs visited the set and did some interviews. It was reported that there will be an episode focusing on Ernie and Bert, which'll also feature Susan, Gordon, Maria, Luis, and Oscar (and no sign of Elmo as far as I know... Kevin Clash wasn't interviewed in any of the videos posted at Tough Pigs... Then again, Caroll Spinney wasn't interviewed, either).
The episode involves Ernie and Bert's apartment getting flooded so they have to sleep in Susan and Gordon's apartment. I wonder if it'll be multi-part (I have never known any Sesame Street episodes to take place over the course of multiple days, and I can see this plot needing to show the following morning). Supposedly there'll be a scene where Oscar scuba dives in the basement. It's too bad Sesame Street can't freely use Kermit anymore, because I feel this episode is begging for Kermit (I don't know if the basement gets flooded because of a flood, but that would call for a news report... And Steve Whitmire is obviously on set).