Game Freak has never been in charge of making console games or spin-offs like the Ranger series, so you can't say "Game Freak hasn't done much with Gen V because of [spin-offs]" when Game Freak had nothing to do with it. Genius Sonority and Hal Laboratory were the ones who did not do much in Gen V. Their inactivity does not limit what Game Freak can do anymore than Jupiter Corporation's lack of activity hindered the release of Gen V games.
HAL Laboratory only did the first Pokémon Ranger. The second and third were done by Creatures Inc. who have been very busy this gen with Pokédex 3D, Pokédex 3D Pro, Pokédex iOS, PokéPark 2 and Pokémon Dream Radar. HAL have done nothing Pokémon-wise since
Oh he Seribii! so what do you think (or know don't you have a ton of sources?) about the supposed new Pokemon?
Too early to tell