Dave Besbris (Bez), Vice President of Engineering at Google, said yesterday at the Amp Conference that they do not use AMP as a ranking signal despite what people think. And as we pointed out here several times, including this morning, page speed is not a mobile ranking factor (although Bez did not mention it).
He said if they decide AMP by itself turns out to be a signal that signals that this page is a better page for search quality- they may decide to make it a ranking factor. But right now, AMP is not a signal that shows Google a page is better quality. The page may be faster and quick but it doesn't mean the content and information on the page is any better than a page not on AMP.
He said he won't rule out that AMP will never ever be a ranking signal but his attitude was that it probably won't be a ranking signal.
Forum discussion at Twitter.