There's been some thought given in some circles about Charlie Evans being the possible villain, but outside of the fact Cumberbatch looks a bit old for Charlie, there's the part in the synopsis that indicates the villain was part of Starfleet (or at least the Federation)...
I'd make Charlie a low-on-the-totem-pole guess, but not outside the realm of possibility in the JJverse.
Never keep a Vulcan waiting...
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