I'm not sure I want to say it. I could already see the "Mikono is an angel" team gonna flare up, even if it's not as negative as any other possibility 
Anyway, finally got better source, and so translating a little bit more~
- Kaji says that Amata and Kagura has a strong connection to each other.
(I'm unsure where the second part of the statement in polyphoni blog comes from... The other source had really different direct quote :v)
- Kagura will have massive & unpredictable development soon. Expect massive gap. (READ: How pre-and-after are so different--think of Jin.)
Also:
There is better (and seemingly more accurate) summarization for this:
- At the initial development of the relationship plannings, Jin and Yunoha was actually not planned to have any relationship. (as opposed to the puppy love they have in these episodes)
- Everyone (the seiyuus) are afraid that their characters might die now.
Taken from here
(Oh yeah, only the polyphoni blog actually mentions the back cover, so don't take that as an official statement for now
It might be just some hopeful fan)
Ah well, I guess I could recheck this once I get my spoon. copy.
If I didn't fangirl too much on the Kurahana-sensei poster that is!