So, I already made a preliminary setlist...
It's basically everything from Emerald Break and M-Rayquaza Battle Deck plus those 3 cards from the Xerneas vs Yveltal deck released in japan, namely Pancham, Pangoro and Slurpuff.
Then, I think it's sure the promo AT Fearow will be in the set, but the AT Salamence, not so much. While it makes sense, I don't think they will want to include that Slurpuff without a matching Swirlix (they usually avoid that), so they may use the alternate art promo of the Swirlix from Phantom Forces released in japan. If that's indeed the case, then there's no room for AT Salamence, and as such, it'll probably be released later as a promo.
Finally, I believe the promo Energy Recycle will be included as well since it's a new card and to conclude, some Trainer reprints (like Ultra Ball or wtv) to fill the few gaps existing in the Trainer line-up.