What we can get on the European X5 is an Auxiliary Heater. It is Great.
It does not start the Engine but warm up the whole car. It 's a burner that runs on gaz or Diesel. I already have thsi feature on my 5 and Ilove it.
You just need to tell the car when you want to leave. The Start up time will be calculated automatically (on my 5).

The X5 option Code is 536 ( 1,600 EUROS , about $2000USD) .