BMW is working on a new generation of the X5, and once again there will be a high-performance X5 M. The latter has just been spotted in prototype form and is believed to be packing a twin-turbocharged V-8 with as much as 600 horsepower on tap.

Another prototype spotted today is believed to be for a new Jaguar XE SVR. Think of it as a slightly tamer version of the absolutely ballistic XE SV Project 8.

Mercedes-AMG has also started testing a prototype for a new model, in this case the next-generation GLE63. Like the X5 M mentioned above, the new GLE63 is also expected to benefit from a twin-turbo V-8 with around 600 horses.

You'll find these stories and more in today's car news, right here at Motor Authority.

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