Wonderful! Some fairground organs / street organs / mechanical organs produce really beautiful sounds, and I've often wished there was a set available for Hauptwerk. I hope there will be some ranks with “flutter” tremolos, which I believe are produced by placing holes in the cardboard controller very close together; the result is an “on-off” tremolo, quite different from that on church or theatre organs.
I particularly like the instruments by Carl Frei, who it seems was also an arranger and composer.
https://www.youtube.com/watch?v=5gyqTy3kiOg
Just had a horrible thought - it's April 1st! I hope this is genuine though . . .