With new Go5g plan coming tomorrow, I’m on MMax with 8 lines, should I add 9th line before announcement?

As stated above, have 8 lines on MMax and know the magic 9th line. Was going to wait it out for another free line, however, nervous with this new plan coming out tomorrow? Would that affect the 9th line structure or adding a line before or after matter?

Basic question, should I add/pay for line before announcement?