Rumours of an entry-level, BMW 3-series-fighting Jaguar sedan have been floating around for quite some time, but thanks to spy-photographers, we now have visible proof that such a model is in the works.Despite this tester's XF fittings, it's clear that what lies beneath is an entirely different beast. The doors have been shortened, roofline adjusted, rear deck lopped off and exhaust replaced, giving a better idea of the new sedan's smaller dimensions and details. Image galleryThe new Jag, which may be dubbed "XS," is expected to ride on Jaguar's PLA (premium lightweight architecture) platform, touting weight-saving materials that should do a lot to keep overall weight to a minimum. Both turbocharged four- and supercharged six-cylinder powertrains are expected to be on tap.Codenamed X760, the new small sedan will reportedly hit the market in 2015. Earlier reports have indicated that a new crossover – Jag's first ever – riding on the same platform will arrive shortly thereafter, so that suggests that the platform will be fitted with all-wheel drive as well. Lots more Wheels24 spy shots.