I really doubt they are letting a Steam release dictate their plans considering the two console versions, and the fact PS4/5 will outsell the others by a huge margin. I don’t know how many “wait a year for Steam because I loves it so” people are out there, but I doubt IOI plan their entire business strategy around them.
That said, wouldn’t be surprised at all if there is a “complete World of Assassination” release in a year or so, and that’s probably our best chance for meaty DLC akin to Patient Zero in Hitman’s GOTY edition.