Measuring blood pressure in a health care setting is a matter of a cuff being put on your arm - much less onerous than measuring ones ECG, which involves placing many electrodes on ones body (and, for some, getting hair shaved in those spots). Yet, Apple managed to provide a decent ECG function in its 1oz plastic and aluminum watch. I don't doubt Apple will find a way to do the same with blood pressure.
Measuring blood glucose is a different kettle of fish. Up to now, all clinical and home-based solutions have involved access to a blood sample. Obviously an Apple Watch would have to find a non-invasive means to achieve the same results - very hard problem, from what I understand.
Is the EKG on the Apple watch accurate? I know it has caught some heart conditions which is commendable and great that it may have saved lives.