Hi Mikealan, thought I'd help you out.
Short Answer: Everything got bumped back.
Long Answer: Let's take it one step at a time.
Due to unforseen events in training the workers at the factory and the price of plastics, Ken's had to take the guys over there to task and make sure S9 doesn't suffer from the same sticky paint issues as S8. So, S9 has now been targeted for a November release, which bumps S10 out to hopefully 1st Quarter 2005.
As for the Mega Muppets and Mega Kermit... well, the jury's still out on that one. Palisades hasn't seen that much demand for the Mega Muppets. So the fate of Mega Kermit is in the balance, though he might be released next year as well.
As for the Mini Muppets... if you want the Wave 4 set of the Electric Mayhem and Rowlf, then buy the individual offerings of Wave 3. What happened is that when Palisades set up their online store known as Palisades Direct, they moved the Mini Muppets to be sold through that route. BTW: Anyone can buy items offered at Palisades Direct. However, if you're a CC member you can buy those same items through the CC's shopper cart and get free S&H on those very same items.
So, the sales of Wave 3 as they're offered at a rate of two per month will determine if Wave 4 gets made. The first duo from Wave 3, Doglion and TMM Kermit, along with the second set of Beaker and Dr. Bunsen Honeydew are current available for purchase at Palisades Direct. And there's also the exclusive Blown-Up Beaker.
Hope this helps, and hope you get buying to help support the line's longevity.