As a developer, I honestly could not care less about a health-spying app that comes bundled (and presumably will be as undeletable as Apple's stock, weather and passbook apps) with the iPhone. I consider such built-in apps as little more than bloatware, so I truly hope Cook & Co. don't really plan to pretend this will be of interest to the general population of developers.
I of course want to know what's new in iOS and OS X, but in all honestly, it's the possibility of an Apple TV App Store that would make my blood warm again. I'm beginning to think Apple is much further behind in the ATV process than they'd like anyone to believe (and losing ground every day as Comcast vies for Time-Warner and Amazon enters the fray).
The great thing about Apple has always been that "everything works" within its ecosystem, but lately, that feels far from true, as my Apple TV feels like the forgotten bastard son of my Mac and iPhone. With Amazon planning to enter the phone frenzy soon (now that they have their tablet and TV products talking to one another), Apple REALLY needs to step up its game in the living room.
I'm sure there are a lot of health conscious people that welcome these integrated features.