Per Microsoft: "App contracts and extensions" have existed since day one: http://msdn.microsoft.com/en-us/library/windows/apps/hh46490...

Per Healthcare: that is a really exciting new feature and there is a LOT of potential here. But I wonder how successful it can actually be in the grand scheme of things. I.e. not everyone can have or wants an iPhone.

Edit, expanding a bit:

On the flip side, I am huge advocate for personal health records (http://en.wikipedia.org/wiki/Personal_health_record), but no one really knows about them and no really uses them because they don't work with your doctor. I don't think Apple has even remotely come close to solving the overall problem of integration and usefulness, but maybe it will get more people interested and thinking about the concept of a personal health record.