Guys who definitely graduate to pro this year: F E.Cowan, D N.Chadwick
I believe McCue and Holinka are also pro eligible this year due to age, but i'm not 100% on that. (Leafs could decided to sign overager Lisowsky but they passed on that last year.)
I think Joe Miller might be ready to move on from NCAA but i don't know if he's in the leafs picture anymore. I don't think any of the euros are guys they want to bring over yet, hopefully Johansson gets to the SHL this year on more of a fulltime basis.
F T.Voit and D C.Sharpe could make the fulltime jump from the ECHL to the AHL too, though Voit looks like a lost cause tbh. Sharpe is interesting tho.