What is Brake To Vacate (BTV)?
According to the Airbus website, Brake to Vacate is a feature installed on newer A-380s and also on the new A-350XWB that allows the pilot to select which runway exit s/he needs to use, and the system will brake hard enough, but just hard enough, to slow the plane to taxi speed by that turnoff.  This minimizes time on the runway.  The following quote is from the Airbus website.  


  Brake to Vacate allows pilots to select the appropriate runway exit during the approach to landing, and regulates the aircraft’s deceleration after touchdown – enabling it to reach any chosen exit at the correct speed under optimum conditions, no matter the weather and visibility.


To my knowledge, Airbus is the only aircraft manufacturer to incorporate this feature - to date.  

This feature does not reduce the amount of runway the aircraft uses.  Maximum Braking is still maximum braking.  It does however, optimize the braking so that the aircraft gets to the taxiway intersection sooner (doesn't brake too hard too soon, keeping speed up) and also prevents overshooting the intersection requiring a relatively slow taxi to the next turn off.