Lekkermaki will likely need a year to the majority of the year in the AHL. He'll likely get a handful of games at the mid point of the season to give him some exposure to the speed and physicality of the NHL, but I don't think he's going to play and real role next year.
We have other guys that appear to be a bit further along in their development that will likely get the call first. All of Raty, Karlsson, Bains, Sasson, and Podkolzin all deserve a serious look based on the seasons they've had, especially if a couple of them take another step for next year.