Mayebe FA Landorus will be in some kind of promo box. Mayebe with a jumbo full art and the regular card. Something like this was done with Dialga & Palkia Legend and Drakrai & Cresselia Legend. Mayebe even a 3D jumbo version like in most other TCG jumbo promo boxes.
EDIT: Thundurus and Tornadus in the theme decks is possible, but there is still the other Landorus promo that went with Red Collection. Mayebe a big box with the Gift Set Thundurus and Tornadus, the Red Collection promo Landorus, and the full art Landorus. This box could be released around the two-part special featuring the three when it comes to the US. Or, the next English set could feature them as EXs, while they are in decks like Zekrom-EX and Reshiram-EX in Japan.
EDIT: Thundurus and Tornadus in the theme decks is possible, but there is still the other Landorus promo that went with Red Collection. Mayebe a big box with the Gift Set Thundurus and Tornadus, the Red Collection promo Landorus, and the full art Landorus. This box could be released around the two-part special featuring the three when it comes to the US. Or, the next English set could feature them as EXs, while they are in decks like Zekrom-EX and Reshiram-EX in Japan.