The English product description confirms that Pikachu & Zekrom-GX, Hoopa-GX, Cobalion-GX, and (shiny?) Lycanroc-GX will be in the set. Thus, our English set will be comprised of the cards from October’s Dark Order, any new cards from November’s GX Ultra Shiny, and of course December’s SM9 Tag Bolt set.
Pikachu & Zekrom-GX was already revealed at Worlds. It is card #33/181, so our set will have at least 181 cards.
The set’s Elite Trainer Box will feature both Pikachu and Zekrom.
Update: Team Up will have six TAG TEAM Pokemon-GX, six more Pokemon-GX, four Prism Star cards, and more than 25 Trainer cards. Gengar & Mimikyu-GX will probably be one of the TAG TEAM cards.
Update #2: The set description only says Lycanroc-GX, not “shiny” Lycanroc-GX. I meant to put “(shiny?)” before it and edited it within seconds after posting but didn’t realize my edit failed to go through. We’ve been having server issues and timeouts the past few days from upgrading to HTTPS.