A Hungarian blog has posted more information that lends credence to the rumor that the Ninjago theme will be returning in 2014. http://www.kockamania.hu/blog/post/LEGO-Ninjago-2014?id=84
The image and set information indicates that the antagonists will be in the form of cyborgs, perhaps veering away from animals due to Chima.
A relaunch of Ninjago will surely please many who thought the theme ended abruptly and prematurely. If it comes to pass, it will be interesting to see the effect on whether or not Chima gains traction. Up to this point, the Chima launch has seemed disjointed and far short of the expectations for the theme's success.