For the additional May update there is one change for abyssea that says

"Placing additional “???” which can be used to spawn certain notorious monsters."

This can be read 2 different ways.

Congested NMs which already have ??? like Briareus, Sobek and Carabosse for example will have additional ??? so multiple groups can fight that at a time.

or

Congested timed spawn NMs that currently don't have ??? like Gukumatz and Heqet for example will be getting ???.

So which change is being made?