As with any kind of rumour, this information should be considered unofficial until Walt Disney World officially confirms.
According to WDWMagic forum user TheVisionarySoul, Disney will be adding The Muppets to The Hall of Presidents at the Magic Kingdom.
“Well, it looks like the cat is about to be unleashed. The Muppets will be taking over The Hall of Presidents. From what I understand, the Muppets will have mostly a narrative role in the show, with the basic principle of the show remaining in tact. The Muppets just posted a cryptic message on Twitter*, and I have a strong hunch this is what this is about. I’ve also been told by multiple sources that something is happening here, so I fully expect it. We should get an official announcement from the company in the next day or two.”TheVisionarySoul
The thread the rumour was based upon is a fascinating read. You can check it out for yourselves here.
Once again, as with any kind of rumour, this information should be considered unofficial until Walt Disney World officially confirms
Stay tuned to Orlando Theme Park Zone for further updates.