I believe his contract for NF ended with the last book, and the last thing I heard was that Pocket was not planning on renewing it. As far as I know he doesn't have any other Trek stuff coming out.
Right now he is in the process of tying up his X-Men comic book series, X-Factor, which he has been writing since 2005. I believe he has more a new comic series coming up after it ends later this year, but I'm not sure. He's also written several original novels over the last few years. I haven't read any of his non-Trek stuff other than his first modern day King Arthur book, Knight Life, but I am hoping to check out the rest of that series, and X-Factor.