>>38267311More than likely. With the A B C listing SM cards have had(at least in JP) it's seeming like they've pre-planned their rotation pattern. No actual announcement, but it's like A's go out this fall, B with the release of the first SnS set, and C once there's enough of gen 8 cards to be without last gen support.
Though outside of the A rotation the timing is purely speculative honestly.