I'm not aware of any advance on this. Perhaps @Miles Roberts can confirm either way?They are investigating this. Some background - in China, you need a separate licence to tow a trailer. It's not a common thing for them, so they don't ever really plan a towing capacity for their cars.
Both MG Europe and MG UK have specified that they want towing capability (if only for the purposes of a bike rack or very small trailer), but it depends on whether the rear axle weight will be rated high enough.