Out of the blue, I've heard that the Indigo Girls are releasing a new album on 24 March called 'Poseidon and The Bitter Bug' with an odd Japanese-inspired cover. I heard about this through the Vanguard mailing list since it seems the lasses have signed to Vanguard for this album.
There'll be a double CD deluxe edition as well as a standard edition of the record. I've no idea when they recorded it since they seem to have been on almost perpetual tour since their last album. Mind you, Amy found the time to release another solo album in the meantime so anything's possible. Watch out for it!