Diesel......dont hold your breath!
Ho ho ho yet another diesel that is set to take GA by storm and yet we hear that this engine has the same vibration problems that seem to turn up with all diesels.
The diesel power pulses are a problem when turning a propeller and so without a big damper the things seem to shake them selfs to bits.
I would put my money on the Lycoming FADEC mogas engine hitting the market long before a re-walmed SMA engine