Plenty of discussion about installing a rear view camera on here. Between the two I'd go with the camera, I had the beeper in my F150 while nice it really didn't help me back up or allow me to see what was going on. I doubt you'll see these added to the Wrangler anytime soon, you can probably find these on other Jeeps that market to the crowd.
2011 JKU Sahara, Sahara Tan, Leather, 3.73, Auto, Hard/Soft Top, SpiderWebShade, Dead Pedal
Coming soon: 2013 Rubi 10a Wheels, New Tires