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I think A2 is a fast-but-imperfect screen update mode suitable for more interactive use. Most (all?) recent O-B models have it.
Doing a quick comparison of K-Pro vs C67 dimensions, I rather suspect that the case will be a slight rework due to the fact that the K-Pro is slightly smaller. Probably visually 'identical' but incompatible (but only an issue if some mixup gives somebody the wrong one for their particular model).
The most obvious use for Bluetooth would be for headphones (as there isn't a headphone jack).
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