CBS Corp. is expected to very soon announce a deal to bring a standalone version of Showtime to Apple TV, Variety reports. The move to provide a broadband-only option for accessing Showtime content follows the HBO Now roll out to Apple TV back in April, although the pricing and official name for Showtime’s new service is still unclear. Apple is an exclusive partner for HBO Now’s $15-a-month standalone service for the time being, but industry…