Sadly, since Star Trek in 2009 the trend has been to put no special features on dvd and all of them on the blu ray version(which is lame) See Tron Legacy dvd
Boy isn't that the truth, sadly, not only do some DVDs not even get bonus features, some don't even get any art on the DVD itself, making it look like you almost bought a bootleg or something. Disney, sadly, has been really bad about this for some of their releases.
I don't own a blu-ray, but I actually do have a blu-ray collection going, since most of them have both the DVD and blu-ray now anyway, it's only like a few bucks extra for the blu-ray/DVD combo, so I figure why not? Just picked up the Dumbo one yesterday, the DVD did have some bonus features, but the Blu-Ray had a lot more, plus again no art work on the DVD itself. So yeah, I'm guessing the Muppets bonus features will be featured a lot more on the blu-ray, but I'm sure it will be in a combo pack at least.