I've also heard a very interesting rumor. Someone on starwars.com claimed that TCW would be resuming in July, and of course, I was immediately critical, but another post contained an image to the contrary. The image shows various information, including the Episodes I and II 3D re-releases, but at the bottom it shows "Star Wars, Clone Wars, 22 New Episodes July-Dec'13. But don't get all excited, I still don't fully believe it. First of all, I'm pretty sure that the 3D re-releases were all cancelled a month ago. Also, if this was professional information, then it would probably say "Star Wars: The Clone Wars" instead of "Star Wars, Clone Wars". In fact, if not for the year, I might wonder if it was from the Clone Wars cartoon, titled Star Wars: Clone Wars about a decade ago.
Anyway, Season 6 in July would be amazing, and I of course hope that the rumor is true, but I'm not going to get my hopes up until I find a reliable confirmation. I will keep posting about Clone Wars Updates and all other Star Wars news!