WotC doesn't need to publish a psionic handbook yet but "creating a disctraction" would be enough. My suggestion is to publish in D&D-Beyond something like "playtesting classes" working like "pilot episodes" and they would introduce classes with special game mechanics: the psionic manifesters, the martial adepts or the incarnum soulmelders. Then the players would be too busy creating homebred ideas to ask when they will be published.
I would like to imagine psionic ardents working as agents and spokemen of the "
egregore", a collective mind or like this. This entity proclaims to be the true voice of the masses, and they could promote more democratic regimes, or to provoke revolutions to establish its own tirany.
Other idea is there is a plane like Duskmourn and the infernal power who ruled this abducted people from the region of Tyr (Dark Sun) during centuries but these weren't so easy to be controlled. There was something like a rebellion and different infernal powers were overthrown. Now the descendents of these Athasians have discovered the way to travel to other D&D worlds but their punk-like look is too weird for the natives of other wildspaces.
I like the idea of using astral constructs like a exosuit or powered armour. An example could be Isako Ichiki/Armour from Marvel comics. There was a class, the aegis, published by a 3PP.
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