I can easily see a drone/quadcopter popping out of the lightbar, or a box on the roof of the cruiser to record, pepper spray, or tase someone, or explode a sticky-net over them... whatever.
Give it 10 years. The main limitations are sensors, image/navigation processing, and battery. The motors and ninja-batman flips and turn on a dime stuff is possible with hobby units now.
GPS is pretty good for roads and houses, X-26 Taser could just as easily be replaced with a "Sic 'em!" laser-pointer/designator. But it's not so good for stuff like power/telephone wires, doors and windows (if they're open or not) and trees etc. .mil or DARPA project could probably turn something out in a year, but at a price/size the police can afford, a decade.