As of right now, the leading candidate for a new ST series is JJ Abrams and co, and Lindelof stated they were interested in producing one IF the next movie is a success. To which I say: I'm already awaiting the announcement.
Either them or Kurtzman & Orci, who now have their own independent production company. There's been speculation that K&O could produce a Trek animated series, much as they've done with Transformers Prime
Still, of all the producers who've thrown their hat into the ring as potential makers of a new Trek series, the ones I'd choose are Bryan Fuller & Bryan Singer. I bet they could come up with something really interesting.