That would be exceedingly silly and not intuitive at all, considering ACN is a dps class, while SCH is a healer. If your points don't change when you switch to a job from a class, you're going to have a lot of people leveling ACN and finding out that they wasted 15 or so points on INT.
If that is the case, it is a very, very poor design decision.
Based on this statement, that is in fact how it will work. Yoshida also commented that it won't be possible to just change your stat allocations whenever you want, so I'm assuming it will require an item that is relatively difficult to obtain (like it was in 1.0) or it will be exceedingly expensive. In either case, consider this thread a warning to spend your points wisely when leveling Arcanist, because the choices you make are the ones you're stuck with regardless of which Job you pick.