Backers were originally anticipating Steam keys, and some have asked that they still get them as their backer reward when Shenmue 3 launches. That won't be happening, unfortunately. If you want a Steam key, you'll have to wait for a year.
Yet another slap in the face to the people that helped bring this project to life. I can't imagine many people will sit waiting an entire year for their originally promised Steam keys instead of getting their money back and spending it elsewhere. I know that's what I'd be doing.