Surely we will get those catalysts that were data mined by now. It’s been ages, and so many exotics don’t have a catalyst and really need them:
Ace of spades
Thorn
Malfeasance
Wish ender
Lumina
Last word
Chaperone
Arbalest
Trinity ghoul
Wavespiltter
Lord of wolves
Black talon
Two tailed fox
Queenbreaker
Thunderlord
That’s almost half of the exotics.
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Catalyst were only introduced as a way to stealthily buff exotics. "New" catalysts just remove some mechanic from the gun then add it back with a catalyst.