An item of note – the display of blood glucose data has been disabled for the moment when it comes to the Health app, since Apple continues to iron out whatever kinks that are there while increasing the compatibility list with devices that show off the metric in mmol/L. Right now, the Health app does not enable one to input data manually using that particular unit of measurement, hence its removal is there to prevent any confusion from happening.
As a fix is in the pipeline, third-party developers are still able to gain access to the the APIs, so fret not. Hopefully iOS 8.1.1 will arrive shortly after the developer beta version hits, and with it will be a fair number of stability updates and the ilk. Are you looking forward to it yourself?