In the episode titled, "Special Release: Kevin Kiner" released on June 11, 2013 at approximately 20 minutes into the episode, Kiner talked about his work on the bonus content.
"We have about ten shows that we're still working on, that are going to be part of this special material. And even hopefully there is going to be a soundtrack record as part of this special material. We'll see they're in negotiations about that so we're not positive that's going to happen. "
The three Clovis arc episodes are "An Old Friend," "The Rise of Clovis," and "Crisis at the Heart." These episodes were 4.19-21 in production order meaning they were produced at the end of the season four batch of episodes. They were originally scheduled to be episodes 6 through 8 of season five.
This could mean that we are getting the Clovis arc (3 episodes) plus an additional 10 episodes. The Order 66 arc (4 episodes?) and a Sifo-Dyas arc (4 episodes?), and then 2 more unknown episodes. Star Wars Underworld captured a Twitter discussion from TCW writer Matt Michnovetz which seems to confirm that he believes the Order 66 arc and the Sifo-Dyas arc are both 4 episodes in length. It is also important to keep in mind that there are two arcs that we know about that may or may not be getting finished, one of Michnovetz's Bounty Hunter arc and the other is the Yoda arc. The Disney Star Wars Weekends clip of Yoda and Anakin from the bonus content may have been from another arc, not the Yoda arc that has been discussed by TCW cast and crew.
The other interesting aspect of what Kiner had to say was connecting the soundtrack and the bonus content. Could it be a DVD/Blu-ray plus soundtrack combo pack?
I will keep you posted as soon as any Clone Wars news breaks, but I think we will be waiting until Star Wars Celebration Europe (July 26-28) before we get any official announcement about the form and content of the "bonus content."