It'll be interesting to see how it plays out but yeah, suddenly evolving multiple is looking like an interesting prospect, especially in case this ever makes its way to gyms/raids.
A lot of possibilities with AP now: Giratina stands to become even more menacing. I'm curious if it will be worth adding to Rayquaza now? It's a shame DT/OR is fairly underwhelming in PvP. Maybe being able to get a stat buff in could help its utility.