Ok. Found some insight news about this.
Long story short, it's a speculation list of which idol is going to join AV in year 2017. Talking about the probability and some wishful thinking. Nothing concrete at this moment. So please take this as a grain of salt.
今井メロ （Almost certain）
小野恵令奈 （Heard about it）
畑山亜梨紗 （Heard about it）
高橋みなみ （AV agency seems to be trying to contact）
高部あい （AV agency seems to be trying to contact）
亜里沙 （Rising rapidly）
嗣永桃子 （DVD makers are keeping their eyes on）
手島優 （Looking for a good target）
中島知子 （Debut incoming）
細川ふみえ （AV rumor Emerging）
Year 2017 just began and it's still a long way for us to go through. So let's see whether it's a BS or it's a dream come true.