Actually season 13 was the first time that we did not get any advance orientation, and we haven't this time either.
I wasn't sure if we did or didn't, but the "Welcome to Season 13! (cont.)" news post stated (my emphasis added):
In economic news, as we announced a few weeks ago, the salary formula has been automatically retuned and salaries will typically be 3-6% lower on average in Season 13 for the same amount of skill.
This leaves me with the impression that at some point, the BBs did give advance notice.