Our always busy spy photographers have just sent us some latest pictures of the next-generation BMW X5 SUV (uh, sorry...SAV). The new Sport Activity Vehicle, codenamed F15, is due to arrive in 2014 and it will ride on a heavily revised version of the 5-Series sedan's chassis. BMW wants to reduce as much weight as possible in order to improve fuel economy, so taking advantage of the 5-Series's chassis makes complete sense. Development is still at a fairly early stage, so we're not fully sure what the final engine lineup will be.

However, sources have indicated that the typical range of 6- and 8-cylinder gasoline and diesel engines will still be on offer. The twin-turbo V6 will most likely return, but the question is whether BMW engineers will be able to cut enough weight out of the new X5 in order for the new turbo-charged 4-cylinder to provide sufficient power. Active Hybrid and X5M models are also certain to once again return to the lineup. Production for the new X5 will likely begin in late 2013 at BMW's Spartanburg, South Carolina plant.