But if it is not ready, Google will not release it, even by the end of the year, within the 2015 year.
Gary Illyes from Google posted on Twitter that although he doesn't "know the exact timeline," Google will "not release something unfinished."
Here is the tweet:
@mrjamiedodd oh, mine as well :) I was only half serious. I don't know the exact timeline, but we'll not release something unfinished— Gary Illyes (@methode) November 11, 2015
I still do expect it by the end of this year, probably right around the holidays but as long as it is not during the mad rush of Cyber Monday and Black Friday, that should be okay. Although, Google has said they try not to release major algorithms during the holidays.
Forum discussion at Twitter.