Coming to a Water-Taxi near you, Yanmar to offer this robust outboard. http://www.yanmarmarine.com/News-detail/YANMAR-LAUNCHES-THE-DTORQUE-111-TURBO-DIESEL-OUTBOARD/
Out in Singapore there is a company dedicated to keeping those old motors running or restoring them, the local fishermen love'em. Sadly they are on the way out these days. This new one seems to be a huge leap ahead in terms of sophistication and smoothness.
50hp, 175kg, kind of heavy. A lot of boats currently running that size engine can't handle that much weight on the transom. And I expect price to be high, have to see if commercial users want to pony up for them. Cool engine though, hope it catches on and they get lighter and cheaper.