Just as its elder did, Sword Art Online: Lost Song will be including English subtitles and menus in its Asian version. Play-Asia has the game available for pre-order on both PSVita and PS3, both of which are region free.
The Asia version release is currently just “May,” while the Japanese version is slated for a March 26 release. The latter will be available in a decked-out limited edition, but that one’s 日本語ばっかり, so choose wisely.