Ionic vs Blaze - New Sensors? New Data?

[Zharko]

I had a few questions regarding the new hardware and what, if any, new data Fitbit will make available to developers:

1. Can someone provide more detail as to what additional sensors the Ionic has over the Blaze? 
2. What additional biometric information will the Ionic offer that the Blaze does not (and which will be accessible via the API)? Will the SpO2 information be available via the API? At what resolution?
3. Will the Fitbit Studio service allows third party app developers to direct access to individual hardware output without having to go through the Web API? (e.g. straight HR information or even movement sensors like the accelerometer or altimeter...) 

Thanks!

[wmchapman]

from Link and Link

Aside from the typical accelerometer and motion-detecting sensors, there's also an optical heart-rate monitor, GPS, NFC chip, an SpO2 sensor, and 2.5GB to store onboard music inside. The optical heart-rate monitor is similar to one used by Alta HR; but it has been improved in the Ionic, both in its algorithms and in its design.
The underside of the smartwatch lies flat against your skin, which should help the heart-rate monitor glean more accurate readings of your pulse. Many other fitness devices have bubbles or uneven surfaces around the heart-rate monitor, and those can create pressure zones on your wrist that can impede the sensor's reading. The flatter the sensor lies against your skin, the more accurate it should be.
The newest, and most surprising, sensor to make it into the Ionic is the SpO2 monitor, which tracks the amount of oxygen in the blood. Fitbit claims this could help the device alert the user of sleep apnea, a condition that causes breathing interruption during sleep. You're more prone to sleep apnea if there's a lack of oxygen in the blood, so Fitbit's hoping the Ionic can tell people if and when this happens. It may be hard to test this feature, not only if you don't have sleep apnea, but also because there doesn't seem to be a way to randomly check the level of oxygen in your blood. Maybe that feature will come in the final version of the Ionic or down the line in the future. All speculation until deliveries begin.

The tri-wavelength sensor, which can distinguish between red, green, and infrared wavelengths, allows the device to gather more fine grained information like relative blood oxygen level.

[Zharko]

Thank you @wmchapman for your help. 

Any way someone from Fitbit can respond to the parts of my question which weren't addressed?

[ErickFitbit]

@Zharko Check out the device API docs, here.