How about the Thexians? They're briefly mentioned in the 5th Edition Rulebook, are from the Bloodmoons of Thex Prime, and according to the book are normally traders and masters of guile, but when roused to war make extensive use of genetic and cybernetic enhancement.
They are supposedly quite an influential force in the galaxy, so why not?
Also, the Hrud deserve a Codex, they're so frequently mentioned but they have no rules or models.
What we really need, however, is the return of "supplement" Codices, like the old Catachan Codex. They would be books that allow you to take additional small forces with your main army, almost like allies. Some examples could be:
Exodites and Harlequins for Eldar.
Genestealer Cults for Tyranids.
Deathwatch Kill Teams for Space Marines (of all flavours except Grey Knights and Space Wolves).
Adeptus Mechanicus and possibly more Abhumans, Beastmen etc for Imperial Guard.
Adeptus Arbites for Sisters of Battle.
Renegades, mutants, traitor guard and so on for Chaos Space Marines.
Freebootaz for Orks.
Demiurg and others for Tau.
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