A pure guess, but as the current range refresh of the existing models has been released in the last four years (which is remarkably rapid) then maybe it's time for something new. & since Morgan reuse other manufacturers' powertrains, 'new' means reusing power from Ford or BMW's toybox.
Back in 2000 the Aero was used to showcase new technology & design. So what chance a new Aero Coupe (which wouldn't compete with the Plus 6 on style) and a hybrid EV powertrain? Packaging lessons learned from the Plus developments would give plenty of cabin space, with a long flat luggage deck, reached by an opening glass hatch in a Plus 4 SLR-style rear shell. With a low centre of gravity, heavier nose/lighter tail weight distribution, & rear wheel drive, the car would feel like a Morgan.
I'd guess the CX platform has already been designed to accommodate hybrid power. Something like the powertrain from the hybrid BMW 2 series Active Tourer model - which gives over 300bhp and quick charging tech with an electric range of c50 miles.
& then launch hybrid Plus 4 and 6 over the next couple of years - with BMW's approach of using the same petrol engine in both 4 & 6, in different states of tune, to produce the two different models.
Hybrids can be sold up to 2035, so the range would have a 10 year production run.
Just my 2 cents
Will
I concur. The two BMW motors used by MMC are designed to function as PHEVs.