@yoshif8tures I believe Populous designed it, those responsible for the newer sections of Silverstone. All their planning documents are here: http://circuitofwales.com/plans/documents.html
The layout looks really interesting. One big track, two smaller tracks that look like they can be run simultaneously, and those big, long spectator sky bridges look like an inspired idea!
Looking forward to watching the BTCC/British GT race here, as I’m sure they will.