Not exactly what you want, but there is Sportiiis, that gives you pace, hr, cadence etc with a visual led bar and audio prompts. http://4iiii.com/2012/product-sportiiiis/

There is also the o-synce screeneye x that is a visor that gives you a heads up display. http://www.o-synce.com/en/products/running-fitness/data4visi...

What you want is coming, what exists now is very basic. It's juts take time until the technology hits the price point to make consumer products possible.