Here's an unboxing video (not mine) that I found over on XDA. Overall, I'm a bit disappointed in the car dock, since it looks like the E4GLTE version does not have the included cable from the One X version, and it's not the same design for the attachment arm/suction cup. However, it seems that it is compatible with cases.
HTC Evo 4G LTE Car Dock Unboxing
XDA Thread
HTC Evo 4G LTE Car Dock Unboxing
XDA Thread
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