I don't think there's much room for surprises. Robertson is 100% going to the Marlies at this point, ditto for Ho-Sang (assuming he signs which doesn't seem like an issue). Gusev doesn't seem to have impressed much at camp so he'll probably be let go. Based off the practice sessions the top-9 forwards are basically set at:
Ritchie-Matthews-Marner
Mikheyev-Tavares-Nylander
Kerfoot-Kampf-Kase
I guess it's a bit of a surprise to not see Bunting in that group considering he started with Tavares, but if Mikheyev doesn't capitalize on that opportunity I'm sure he'll be the next guy up there. 4th line hasn't seen any time together at camp but it's hard to not see it be Bunting-Spezza-Simmonds. Defence is pretty much set as well. So the only question mark at this point is which player the Leafs keep up as the 13th forward or 7th defenceman.