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Not sure about that info, as we can't be 100% sure that interview was real... (I think it was tho) It was held one and half year ago, and Kubo mentioned we're in the midway, ...I don't think 8 years from now is really possible, but I do see the last arc lasting ~5 years. (But then, if it doesn't ever bounce up in ToCs and the sales fall again, they might make it shorter... but I don't think it will happen, with this kickass arc.)
I kinda wish to know more about Isshin, Aizen, Shiba family, Ichigo's birth and stuff like, NOW!! but everything has its time. I think we could know more when Kubo gives some attention to Ryuuken and Ishida, as they seem to be tied to the story somehow.
I think that Aizen and Isshin knew each other because in the part where they have the final fight against Aizen, Isshin says Aizen's name and they seemed to know each other and I think Isshin probably knew Aizen when he was younger or something like that. That's just my opinion though
Aizen mentioned that he "knew about Ichigo since the day he was born" so im guessin he knew/knows Isshin. Their dialogue when Isshin showed up to save Ichigo/while Ichigo fought Gin seemed to indicate that they know each other. I wonder how Ryuken fits into the picture, and Urahara