That's my expectation too. I expect the CHL integration in BeaGM to simply mean you'll be able to follow the CHL during BeaGM, maybe scout CHL games and players, draft them, leave your younger players in juniors but I doubt you can play BeaGM AS a CHL team, unless of course you replace an NHL team.
I'd love to be wrong though. The roster turnover in juniors would likely keep a multi-season mode much more entertaining than it is with the NHL. In the pros, once you've built a powerhouse it's fairly easy to maintain a great team year after year (talking video games of course). With BeaGM in the juniors, you'd basically get the roster turnover of college games without the ability to recruit tons of great players year after year like you do with a top team in college football or basketball.