According to the people that went to Ai's countdown concert, she has confirmed a new album for 2015, songs we know so far are: End, and and... ~10,000 Hearts~ , Reach to the Moon, Parallel World, Time Machine.
You can listen to some songs already:
parallel world
https://www.youtube.com/watch?v=Yzb5...ature=youtu.be
reach to the moon
https://www.youtube.com/watch?v=HaWW...ature=youtu.be
credits: channel Ai forum