See my thoughts about this are that they'd want to milk their 86' line members while they still can before they enlist this upcoming year. Eunhae are supposedly preparing for a Korean album though.
At the same time, I don't think their future is unclear. All SuJu members re-signed with SM a couple of months ago. Their contract probably will be another 5 years minimum - I don't believe the details were posted. SM is likely going to give them more solos and subunit projects until Kyu is done with his service in 2018/9 (depending on when he enlists) and the whole group is together again. In the case of a SuJu album, 7jibsus is likely the last one from 'Super Junior' for a while, and it's really unfortunate that SM is keeping them from the ceremonies. With Sungmin + EunHae + Siwon + Wook + Kyu in the military (and there will be some overlap) that's a majority of the vocal and dance lines as well as the 4 most popular members (EunSiHae + Kyu).
It sucks that SM is keeping them and TVXQ from the end of year ceremonies when both groups had outstanding sales, and many of the members are enlisting. Especially for TVXQ, it would have been a nice 'goodbye for now' present. In reality, I'm more upset SuJu didn't just leave SM when they had the chance when their contracts were up.