Could this be a Model 3 test mule, rather than a Model X beta? Here's my thinking... First, why would Tesla disguise a vehicle they've already shown on their web site and at at numerous car shows and events, unless they've made significant design changes—which is certainly possible. Second, after a simple photo analysis, it appears that this test vehicle has a shorter wheelbase than the Model X prototype. I would have thought that Tesla would share the Model S battery with the Model X for economic reasons, not to mention its platform. Test Vehicle — wheelbase/wheel diameter = 4.3 Model X Prototype with 19" Wheels — wheelbase/wheel diameter = 5.3 Model S with 19" Wheels — wheelbase/wheel diameter = 5.6 Model S with 21" Wheels — wheelbase/wheel diameter = 5.1 These ratios were determined with pixel dimensions, a crude method to be sure. But even so, it seems as though the test vehicle has a shorter wheelbase. The difference in wheelbase length between this test vehicle and the Model X prototype appears to be about 20%. This is pure speculation, but that is also the expected reduction in size for the Model 3.