call me narrow sighted or a pessimist, but this healthbook is an absolutely usesless featgure and will go to the garbage folder along with passbook and newsstand, stocks, etc.
as someone that's been using jawbone for over a year i don't see how this will improve my experience at all and will actually add a 3 app that i need to use.
Current process is this:
1) log your food into myfitness pall
2) log your jawbone & activities into jawbone app
3) jawbone app does a one way sync of food from myfitnesspal and provides a complete summary like healthbook would.
unless healthbook would let you log directly from itself into myfitnesspal and jawbone there really is no use for it. myfitnesspal, especially, has built their own brand and database on food and want people to use it, what incentive do they actually have for going though middleman-apple.
for those that already utilize jawebone or fitbit, etc, the "healthbook" is already here and they're using it -- healhtbook adds nothing.