The Bentley SUV is known internally as "Falcon." Production will not be in the UK however but at a Volkswagen plant in Eastern Europe, apparently Slovakia. The powertrain will likely mirror the Continental GT which means turbocharged V8 and W12 power.
This should not even cost VW all that much to build considering all the Bentley GT parts which can be borrowed. The question really will be the pricing. Rumors currently have it at over $200k... making this likely the most expensive factory luxury SUV on the planet.