Remember that strange-looking little car known as the Z3 Coupe? Well, BMW waited about three years and now it appears to be ready to bring it back to life. At the Frankfurt auto show next month, BMW will show a concept version of the Z4 coupe with the intention to start selling them next summer. Based on the picture we've seen, the Z4 coupe is slightly better-looking than its predecessor — but that's not really saying much. And by the way, BMW is planning to have the Z4 to compete with the upcoming Porsche Cayman…good luck, boys.