If this is included in the final release, it'll be the Final Release
I think it's safe to conclude that if this keylogging "feature" stays beyond the development stage and into the Final Release version that this will be, for many, the final release. What corporation would willingly and knowingly accept the obvious liability that such an aggressive and inviting attack vector this "feature" represents?
Enough retailers are being targeted for their secure financial data as it is. No point in giving hackers and malware authors such a ripe target as this "feature" represents. Can you imagine a corporate R&D department doing any new product development on a machine running Windows 10? What about banks and financial services? Governments? You get the idea.
Not going to happen. MS might as well close it's doors if this is their intention for a final release.