I clarified how the new rules work with a Tsuen Wan CS who spoke to her supervisor

If you are AM/GR and clear your list on or before 24 Feb
The five spaces on your list will be considered "Initial" on 25 Feb (akin to grandfathering)
You can fill them in partially or in one go on or after 25 Feb without charge

After the initial five spaces have been expended
You can still do three amendments per membership year (even on 26 Feb 16) for US$50 per space

AM/GR can process three amendments per membership year.

(MPO changed their position to withdraw grandfathering of 25/2 blank places, please see post #15 for their newest "lifetime" position)