Looks like the trial of TFs Mighty Muggs may have only lasted 2 waves, and they haven't even been released yet. If retailers aren't interested, the distributor (Hasbro) may have just cut their losses and stopped the series before they started manufacturing the 3rd wave of Shockwave and Jazz. Since we are the dumping ground for any failed toyline, we will probably see the first six of the TFs MMs (Op, Meg, BBee, Soundwave, Grimlock, Starscream) in our stores.
This American wholesaler lists them as cancelled, as not even being produced by the supplier:
http://www.entertainmentearth.com/pr...umber=HT90931C

They removed the Shockwave and Jazz pics, so go here for a look at what they would have looked like:
http://www.tformers.com/transformers...0832/news.html

This could also be an error by that wholesaler, or, they are just not stocking them anymore and mistakenly said they weren't being produced.