I've noticed a few ads on Marketplace for folks selling their OEM Dunlop runflats. The listings are for 5000 series. Mine came with 3000 series, and IIRC, these are summer tires, not A/S.
Is this correct? Should I be looking to replace these ASAP? Why would MINI put summer-only tires on as OEM?

 

When I ordered my car the sport package came with the option of All-Season or Performance tires. Maybe your salesman didn't ask and just selected them for you or maybe that got chosen by accident. I would consider getting some winter wheels and tires or at least some all-season tires for your wheels if the weather gets bad where you live. Tire Rack has some nice winter wheel and tire sets that aren't to expensive. That would give you the chance to save your current set for spring.