A quick look around suggests it will be Lord's, the Oval, Headingley, Trent Bridge, OT, Edgbaston, and then you'd only have two from Cardiff, Southampton, Bristol and Durham. Probably not Durham, so two from those first three. Surrey and Yorkshire will insist on playing with their own names, too.
I think it's an absolutely terrible idea that London-centric money men have come up with without any sort of understanding of how English cricket actually works.