The article lists some information about staff updates and casting. Masami Kikuchi, Ai Orikasa, and Haruhi Nanao (from Ai Tenchi Muyo) will be returning to play Tenchi, Ryoko, and Ayeka respectively. Hideki Shirane (scriptwriter for War on Geminar/Isekai no Seikishi) will also return to supervise and write scripts for OVA 4.
They've even chosen an ending theme song: "Shake the DiCE" by Serena Kozuki.
I'm not entirely sure on an exact release date. One article I read mentioned an October premiere, but on the official website there seems to be a November date displayed: 11/30/2016. Maybe they had to push the release date back? Unfortunately I can't read Japanese, so I'm not sure. Would it be possible to get a rough translation of the website info?
Based on the new promo image that has been released, it looks like this series will be a tie in to War on Geminar/Isekai no Seikishi, just as others have speculated. The image features Rea, including what appears to be a younger version of her when she was still on Geminar, as well as Tenchi's aunt, Minaho.
Anywho, what are your thoughts? Are you excited that we will be seeing more Tenchi soon...or nah?
Edit: Sorry, I just saw where ya'll already have a discussion about all of this. I'm so late! Anyway, don't mind me...
"They wanted us to die, but we survived."