Well, according some googling, I found:
Exotic Weapons Guide (sounds semi-useful... I always think that most equipment guides suck)
Way of the Open Fist (previously 2 books, Way of the Monk and Way of Martial Arts, now combined into one)
Way of the Diamyo (think Birthright in Rokugan)
Way of the Yakuza
Rather shocked they haven't announced a dual-stat Nezumi, Ronin, or Naga book, since those are the last 3 books that haven't been updated from the original "Way of" line. (Way of the Shadow probably won't be, because the Lying Darkness has been "destroyed," and tejina has been touched on in a few other books, Secrets of the Scorpion and Way of the Ninja, not sure offhand if it was in Magic of Rokugan). Plus, most of the Naga have returned to the Great Sleep, so I don't really see that happening. As for nezumi, not sure how much treatment they get in the new Secrets of the Shadowlands book, but with the current Reign of Blood storyline, they are hinting that something big is about to go down with the nezumi, which makes it all the more suprising...