Assuming the big guns are either "Graduated" or simply not released, and assuming it's a 20-man roster like the last cycle, this is what I'm expecting to see
GK: St. Clair, Pantemis
Def: Chung, Abzi, Miller, N'Sa, Kennedy, Legault
MF: Tabla, Borges, M. Choiniere, D. Choiniere, Simmons, Fraser, Shome, Shaffelburg, Verhoeven
FW: Zanatta, Campbell, Bair
Unfortunately, GK is pretty weak since neither Dayne or James get any playing time. Busti is also an option but in similar boat. He'll also be mid-season and may not be released.
At defense, going with that CPL core. N'Sa, Chung and Abzi have been great for their teams. Legault is versatile. Kennedy deserves a look. Been solid in Austria. Miller seems a more likely bet than Cornelius, who Herdman may want with the senior team, but wouldn't be surprised to see both. Not sold on Bayiha or Kinumbe yet, but if they play more (Kinumbe is hurt for a while though) they could force their way in past a Kennedy or Legault.
At MF, a number of CPL young guns. Borges, Simmons, Verhoeven have all been great this season. D. Choniere been solid when called upon. M. Choiniere a big talent for Montreal and Shome and Fraser are shoo-ins. Shome is probably the captain for this team. Shaffelburg has beena revelation and Tabla, at this moment is probably better off with the U23s.
At FW, we are kind of thin. David and Millar probably don't get called. Zanatta is a servicable option but at the moment Terran Campbell is the man up top. Theo Bair is also looking good too. There's also options like Lamy of HFX and Pena of Valour but they don't play much. Dark Horses are Tyler Attardo or Jordan Peruzza, who are very young still but have shown a lot of promise. Maybe even a Jayden Nelson.
I would have loved to see someone like Dom Yankov or Andreas Vaikla but neither have indicated an interest in playing for Canada at the moment.