Very eager for the long-body gross weight increase! It’s the only thing that I would change on my M20M FIKI. Greater take off and landing weight would make the airplane much more useful. Please keep us updated as more details become available.
FWIW, by definition, an STC is a modification made by someone other than the manufacturer or type certificate holder. A gross weight change provided by Mooney will be likely in form as a Mooney drawing, perhaps communicated officially via Mooney Service Instruction, once an update to the Mooney TCDS (type certificate data sheet) is approved. In other words this will be a Mooney modification to the TCDS rather than a STC.
Be patient, I am sure the factory won’t delay one minute in letting us all know when they have one.
We’re working on it folks! Takes resources and time. The basic design is complete. Now working on prototype and then drop testing. The plane will ride higher on struts and will be much more forgiving on landing.