I've been wondering this too. I have an Xbox One X, and was expecting the Super Duper pack to be ready on launch day. Far from it. Not only is it not out, there is no date for it and any kind of information is scant and very hard to find. I almost feel like I imagined the whole thing.
An official announcement on date would be nice, even if it is the disappointing news that it is pushed back to 2018.
According to the following article they say it’s looking like spring 2018. Hopefully they are wrong considering I bought the X on release with the hope the new update would be out. Considering the said in the Fall. They really need to come out with an announcement letting us know where they are on this.