According to autonews magazine (www.autonews-magazine.com) the Opel Corsa R5 is under development at Holzer Motorsport (same team that developed the Adam R2 for Opel Motorsport). Opel Motorsport claims the project is delayed, but apparently Holzer Motorsport is financing the project themselves now (which is possible since it's part of a huge group that's active in aviation and automotive industry as well). To be continued... :)
Also anyone else heard a rumor that all manufacturers can submit a new (or partly new) homologation for the R5 cars next year?