There are 3 hidden exotics I can guarantee as of rn. The void and solar Thunderlord's as well as the Arc rocket launcher that has something to do with volleys. Perks for all 3 of these were released a week or so before RoI came out.
Edit: Here is a link to the perk list I am talking about. https://gamerant.com/destiny-rise-iron-perk-weapon-armor-raid/
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I'm just gonna assume it's only more cut content that they're saving for the next April update type of thing. That would at least be consistent with Bungie's behavior and leave no room for disappointment.
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Cut content from TTK at best. Icons for those 3 weapons were previously in the armory but with no perks or name. Bungie has implemented a feature that hides weapons from the armory identical to how Outbreak Prime, Touch of Malice and Black Spindle were all hidden. Just because we can't see them now doesn't mean they aren't there. Thunderlord was sold this week to, made me think that just maybe we will see a mission prop up next week in a daily to get one of the other elemental lords.