Core is super cool, but I feel there's a big miss for tracking heart rate. I suppose you could cobble it together with Wahoo Fintness TICKR X and merge the data after the run, but it would be awesome to combine those two products.

Also would be great to see it tie into other devices like cadence / speed sensors for bike rides.

Does show that these types of devices are just around the corner, which is exciting. For me, I'll keep on trucking my phone with me until I get full integration with tracking heart rate and cycling metrics.