When TT of BK Will came back?

Not sure. Until we get an announcement from the devs, we can only speculate if he ever comes back.

I don't think he will come back. They usually have one TT hero per and don't do rerolls. It would be amazing if they did bring him back because I currently don't have one.

Black Knight will probably return. Either as a TT or GC reward. Masked Marth returned twice, so it‘s pretty likely that the other TT reward units will return eventually. But right now, we can‘t do anything until IS decides to bring him back.