JJ20X on
Forumbox has said the following have "Changes to channel codes and subscription packs".
Boomerang, Cartoon Network, Cartoonito, Nick Jr Too, Nick Junior, Nick +1, Nicktoons, Nickelodeon, Turner Classic Movies.
As I'm on the Fun tier I could already get all but one of these, so I can only confirm Nick Jr Too has changed, but not which tiers except Fun.
---------- Post added at 09:20 ---------- Previous post was at 09:08 ----------
Actually as an old channel guide confirms Boomerang, Cartoon Network, Cartoonito and Turner Classic Movies were already on Mix, so unless they have been made available on Player/Mixit, which is unlikely, I doubt anything visible to the average customer has happened with regards to them.
So the obvious changes to most will be the Nick channels, which should be on Mix now.