The only restrictions that may get imposed is they might have to give up some over-the-air TV stations and radio stations. As for specialty channels, I 100% guarantee they will keep them all UNLESS Shaw chooses to sell some on their own accord.
Shaw won't have to sell anything. There are no conflicting assets between Canwest/Shaw/Corus, so the CRTC won't force them to sell anything.
IMO, should they? Yes. Shaw would become an unstoppable behemoth. They are the largest cable company in the country, they have a national satellite service, the will launch their own wireless service this or next year I believe, they own Corus which is already fairly big with TV and radio assets and a production company, and they will soon own Canwest which is already huge, consisting of a national broadcast network and a slew of highly rated specialty channels. That just goes to show you how insane things have gotten here, that the CRTC has actually allowed things to get that bad and will likely continue to allow things to get this bad.
They should certainly have to sell off something, whether it be Corus or Shaw Direct.