Beyond what is specifically mentioned in the ALPG, we have not yet announced a "game plan."
I do hope that that XGE changes (if any) to reprinted content will end up in the official errata, but if that's not the case, I'd love for the "game plan" to include a document with such changes. Since players are required to use the latest version of whatever option they choose for their character, that could sound as if AL is implicitly asking them to buy a book they may not be interested into, simply to keep playing their existing character.