Esserise

Ohmori says that the series will evolve next year and we should have high expectations for it.

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Gameplay-wise, there could be battles involved in these events, but I imagine that the player's team would be mostly pre-set much like in the ORAS demo. In fact, we could play as three different characters depending on the period. But as a reward for completing each episode, we would be able to transfer the following Pokémon to the main series games (via Pokémon Link):

1. Eternal Floette (obviously part of AZ's war)
2. Volcanion (possibly related to 800 years ago, if that was the time it blew up the mountains in southern Kalos)
3. Zygarde with its special moves (presumably related to all three events, with the culmination being the last war)
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They could separate the app into "Story Mode" and "Battle Mode", with the latter having an overhauled Battle Chateau or even the Battle Frontier, for which the player could use their XYORAS Pokémon (no transfer would be needed).

Do you want to discuss app ideas here? The Generation VI thread is flooded with posts that assume Z is the only possibility. It's become cancerous as far as I'm concerned.