News have just been updated on her website
http://avex.jp/ayu/news/detail.php?id=1019007
A ONE will be out on the same day as ayumi hamasaki COUNTDOWN LIVE 2014-2015 A Cirque de Minuit ～真夜中のサーカス～ DVD + Blu-ray
Album wise , A ONE will include 11 songs in total , inclusive of Zutto... / Last minute / Walk with Last minute getting a PV (finally)