These battle changes and the new jobs are likely not even finished yet. They release stuff when it is finished, there is no real time for a "pre-patch".

You can tinker around with the new skills and jobs in the 4 weeks before the savage raid gets released. If you don't raid savage even better for you, you have all the time in the world to level up the new job and go with it into the Endwalker story at your own pace.

Plus it divides the playerbase when some of them are stuck leveling the new jobs in the old zones, wich helps to prevent congestion in the new zones.