As the title says, the AMG site is updated with the new CLS 63 amg "build your own" section and info about it. Also, there is a tab for the C63 amg coupe, but it doesn't load yet, so that should be here any day now...
http://www.mercedes-amg.com/#/cls63-overview
With the performance pack, it should give the M5 a serious run for its money.
That is all,
Matt