When are API's coming back?

That’s not quite true.

First, only the review endpoint got disabled, and that was because it was so huge, that it caused measurable performance loss on the other parts of the website, when it was in use. WKStats doesn’t use this endpoint, therefore you will be able to see your stats there. The main thing that’s affected is heatmap, and that has been fixed for a bit in a way, that stores your reviews locally alongside the old, cached data.

Secondly, this was disabled quite a bit after the last major update, here’s the post if you are interested.