Not sure if he will. He wears number 65 to honour his parents as I believe they were both born in 1965 or something like that. I figure if he doesn't change his number this year, he won't change it. But who knows.
As for Lehner, in the rookie tournament he wears 40, but in the Soo he wore 35, and in Frolunda Jr he also wore 35. So you think he would switch to 35 once he made the team.