CBC is also a premium quality television channel and news/media website. I believe CBC Radio is already ad free. The only ads I hear on it are ads for its own programming.
I hope not. They're not really ads so much as information. They're incredibly short and don't feel like ads. It's basically a, "Tonight at 8 we talk with some professor about some current event."
CBC produces at least 4 radio streams (Radio 1/2/3 in english, and at least one in french), and at least three TV channels (CBC TV, CBC News Network, and Radio-Canada)
To add to what you already have listed: there is a second radio stream in French (called Espace Musique) as well as a French equivalent to CBC News Network (called RDI for Réseau de l'information). There are also regional broadcast (in both French and English) as well as an international version.