Nothing's on the table right now (or at least if there is, no one's leaked the news)
There's a few things you may have heard. There had been several attempts over the last decade to do another primetime Muppet show. There was talk of a show for Fox around the beginning of the decade (before Disney bought them), after the Disney sale, they had written scripts for a possible short term reality show spoof, "America's Next Muppet" but that never went anywhere. The last credible news was around the beginning of 2008 when the Muppets shot a presentation pitch for a tv show. Again, nothing came out of that (plus this was before the infamous writers strike that put everything on hold), but we DID get the news that the Muppets would do tv specials (they were originally going to do an election themed special but it was decided that it would be too dated to later be used for re-airings or dvd releases so they went with Letters to Santa instead - plus the two Studio DC specials for the Disney Channel) and the biggest Muppet news for awhile was the announcement that Jason Segel and Nick Stoller were working on a Muppet movie script to be a huge relaunch effort.
The movie script got a lot of buzz and milage in the press. Jason Segel even talked about it on one of the Jimmy's talk shows (with Statler and Waldorf even showing up to heckle his interview). At one point, one reporter wrote that if the planned new movie went well, that would open the door for another primetime show. Even though he was speaking speculatively, the news media being in the sad state it's in picked up on this article, misinterpreted it and all of a sudden there was a bunch of "New Muppet television show" on the way articles popping up in blogs and entertainment reporters. So you may be thinking of one of those articles, but they were all shoddy reporting based on a rumor caused by one reporter's comment based solely on conjecture and not fact.
...of course since then, we've got the official confirmation of a new Muppet movie from Disney at D23 a few months back (though not the same script that Segel/Stoller were writing). Disney is doing a lot with the Muppets and the Muppets have Disney's full promotional/financial backing now but no news has come out yet about a tv show.
Behind the scenes of course, Disney is no doubt laying out long-term plans for the Muppet franchise and i wouldn't be at all surprised if one thing being worked on behind closed doors was a return to television. But though fans have lots of encouraging reasons to speculate, no credible news has come out about one being worked on. All signs indicate the movie is the next big project being focused on.