it's owned by the Dolans, even if it's a different company from Cablevision and MSG networks, but at one point, But the AMC Networks (formerly Rainbow Media) and MSG were both a part of Cablevison, MSG spun off first and last year AMC Networks spun off. but they are still owned and run by the Dolans, and they hold a gruge with Dish over the removal of the Voom HD channels years ago that's still being decided in court, and not to mention the whole Fuse mess that caused the MSG RSNs to be removed from Dish months after Dish removed Fuse.
if you want IFC HD so bad, switch providers. because it won't be coming to Dish anytime soon.