A lot of people forget that many of the BB@Home/"Plantinum" channels are little more than holdovers from the days when distributors lacked HD outlets on their traditional cable channels.
Velocity was Discovery HD Theater, a dumping ground for Discovery progamming before the other Discovery networks were in HD. Universal HD was the place for NBC Universal HD programming. Palladia used to be Music HD and was the place for MTV Networks HD programming. The MGM and Sony movie channels are a little more unique in that they did not have much in traditional cable properties, but still wanted a place to show their extensive library of films that were being scanned in HD. AXS (formerly HDNet) and HDNet Movies also are unique in that these were HD specialty channels Marc Cuban created to fill the void that existed a decade ago.
The other place these channels come from are niche channels added in the past 3-4 years that Dish did not wish to add to the America's Top packages. Centric (formerly BET Jazz), Logo, WFN (originally launched in HD, but with no actual HD programming, not SD when they have added HD programming), Hallmark Movies, PixL, MavTV, Crime and Investigation, Encore Suspense, and Starz Cinema also seem to fit in this category. Formerly carried Fashion HD and Smithsonian HD also fit. Essentially, if Dish added it in the last 3 years, it wound up here.
The Epix multiplex and Starz subsidiary "Plex" multiplex also probably fit the latter category, but could easily fit in their own packs. Personally, I wish the channels from the first category were removed, except for the ones that have no parent channels (i.e. kill Universal, keep HDNet Movies). Toss most of the ones from the second category in AT250. Put Epix in its own pack (it already is in a $7 pack if you don't want the rest of BB@Home).
Since Fuse fits into category 2, I'd expect it might join BB@Home. Otherwise, I bet IFC also comes to AT120, and We goes AT200.