Surprised no one has mentioned this yet - I did check for other threads and looked in the announced but not yet released sticky thread - Meffert's latest email says:
"Many Thanks for your superb support and watch out for several other new and great puzzles within the next 30 days. The long awaited Geared Mixup by Oskar which now turns like a drean is next"
Original Geared Mixup
Thread - I wonder what else is coming in the next 30 days