I agree the title is being withheld probably because it may play into the plot, or possibly maybe they haven't settled on one yet. I think it likely to be one of the trademarked names, I'm banking on Star Trek: Destiny (not that I expect it to be based on the novel series really just a feeling).
I basically refer to it as the nu-TNG show for now, just to differentiate it from the original TNG show.
Anyone think there's any possibility they actually call it Star Trek: The Next Generation? I personally doubt that, just curious. I mean other show continuations have used the same name as the original show, like Dallas, Roseanne and some others that have been a direct continuation and not a reboot, remake or some other such thing. And as far as I know CBS owns the right to that name already so they wouldn't need a new trademark.