An exciting new patent filing from Apple gives us a peek into the future of Nike+.  From AppleInsider:

“. . . the system aims to more precisely track a runners performance over a period of time by factoring in various physical characteristics of the runner, such as age, weight, and gender, which could then be used to evaluate the runner’s performance against a reference performance typical of a person having similar physical characteristics.”

The upside is better run data and GPS features.  The downside?  It appears that you must purchase a special pair of GPS enabled Nike shoes.  That sounds expensive.

More info available at AppleInsider, Macworld, and MacDailyNews.