New X1 SUV, BMW's engineers are now busy preparing the second-generation X3 which is due to arrive in international markets in 2011. Based on the next 3-Series platform architecture, the new X3 bears the codename F25 and will come with all-wheel drive or as BMW calls it, xDrive. It is possible though that just like the smaller X1, the Bavarian automaker may also offer rear-wheel drive only variants of its compact SUV. The introduction of the X1 in BMW's SUV range should result in an increase of the X3's exterior dimensions in order to further differentiate the two models. As it stands now, the Bavarian SUVs are similar in size, with the X1 being just 4.5 inches (114 mm) shorter, 2.2 inches (55 mm) narrower and 5.1 inches (130 mm) lower than...