I assume you mean Roamios, and yes, the only Roamios with iDevice (and Android apparently coming late Fall) streaming built in are the Pro and Plus. The bottom end Roamio can use the same external Streamer that the Premiere4 have today.

If you did mean Premiere, then yes, you need a 4 tuner Premiere to support streaming to a Mini, and the only 4 tuner ones are cable-only.