It's a new API so I'm sure they all will in due time. Nike will for sure and I'd bet on all the other biggies as well. I'm on the beta program for iSmoothRun and know for fact he's implementing HR right now (BTW, iSmoothRun is the best app).
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I thought most of the majors have done this since just after OS2: Runkeeper, Strava, MapMyRUn, Runtastic, iSmoothRun, etc. I have not used RK in months, but it did HR way back when.
Agreed .. I like the native workout app too. Unfortunately the fact that it holds your data captive on the phone is a deal breaker. RunGap gets you part of the way .. but won't allow you to export map and elevation data. Since pretty much every running/cycling site accepts a common format (.tcx) I dont understand why Apple didn't build an export capability into the activity app.
Cardiogram is nice, I just wish it didn't lot all the tracked sessions as workouts and flow into activity. I just wanted to try my HR for some specific tasks, etc., and all those hours show up as workouts in activity.