DISC page in the official site was updated
For you info briefly,
English sub supported.
There are 3 editions,normal edition(6800 yen),extra edition(8800 yen) and super extra edition(12600 yen).(Blu-ray/DVD are same price)
extra edition = normal edition + special package + special disc inludes TVCM,seiyu interview and etc.
super extra edition = extra edition + special package + Lyrical Party IV disc and booklet