They're only filming PART of season 43. That could be anything from story lines to inserts. And I think I have an idea why. I doubt SS would be coming to an end WITHOUT a big hoopla. We knew about Oprah leaving her show almost 2 years in advance, why wouldn't word that SS is ending be well in advance either? Plus, let's face it. NO ONE wants to end SS. Once word actually got out, there'd be loud, protesting letters calling for someone to get fired. And above all, I've seen stuff on PBS that hasn't had new episodes that have been on for years after they stopped . It's one of two things. 1) They're afraid of another budget crunch at PBS and their own company, so they're taking whatever money they have now and getting some of the next season out of the way... or more likely 2) Just in case the Muppet Movie does well or more Muppet projects are on the way, so certain puppeteers can perform their characters now, before they have to head off to Cali to shoot something else.