At this point, there's probably an agreement in place, that prevents Star Trek coming back to TV (Netflix, still the same thing, serialised drama in the home), until after JJ Abrams production company are done. Another 2 or 3 years at least? Once another film after Into Darkness has been completed. Like October 1986 when TNG was first announced, and Voyage Home had just wrapped, was still weeks away from release but unlikely to be anything other than a success. Something that could fall between the cracks, while one set of custodians were mulling over renewing a contract. Another production team step into a perfectly timed void, and get a 13 episode order during the short duration the right to a new production reverts back to CBS. During which time, Bad Robot are still negotiating for their fourth movie, but have lost the exclusivity small print bit and find they have to co-exist with another Enterprise.