I have been told that the new XCL's will be lighter than last years...not sure how much. I think the weight on the XCL will be marginally higher than a similar bike in its class, but the XCL will be stronger and stiffer as well. Also, the new chainstays are asymmetrical...not sure how that affects tire size, but it may increase rear stiffness too.
They are not out yet.
A little birdie told me they should be available around the end of April.