Zboril, McAvoy, Vladar are sure things.
For Canada, a possible 8 returne at foward make it not too easy for Senyshyn and Gabrielle. Kinda hard to see Gabrielle making it, HC doesn't like player who easily loose their temper. For Senyshyn it really depends on how much he improve this year. I'll say he need to prove he can have a better impact in the game, going for loose puck, understanding how to use his teamate and not operating in a bubble. If he do I really like his chance, if he don't I really doubt he makes it.
Only two returne on D, so Lauzon have a good chance to be there, I know he was the last cut last year but I wouldn't consider him a lock. I'll have competition with Myers, Fabbro, Chychrun, Girard, Bear, Juulsen, etc.
I don't know much for USA. Only 3 returnee on defense and Krys was one of them, so I suppose there's some decent chance Lindgren makes it. At first Fredric looks like an outsider, but the way he play he could really be a role player for their 4th line playing the role Donato/Bjork were penciled in last year.
It's generaly easier to have prospect playing in the WJC when you draft more europeans. To make team Canada you really have to be a great great prospect or to be a HC program favorite to play a specific role. For the US, like I said I don't know enough how they operate and the NCAA guy to really say anything.