Nice try bjornhall!
However any real attempt to update the O-2oo will mean a change to the specification of the type cetificate - that effectively makes it a different engine and means the approvals have to be re-run.
This is definitiely something that Continental will not do. So if there is a D model it might have a different type of magneto but nothing more. Lighter, more efficent,FADEC, absolutely not.
This is an engine that costs virtually nothing to produce (in comparison to anything modern) and that is much of its attraction to Cessna - they know that and will be paying what it is worth - my guess would be less than $6k. At that price it is an obvious choice. Of course at the retail price you would have to be brain dead to select it!