They also released a press release: 'Season 2B picks up with Ben and Maddie feeling uncertain about the mermaids’ future after the deadly consequences of the attack on the oil rig. With the mermaids returning to sea, Ben and Maddie are left feeling lost without Ryn. Once Helen learns she’s not the only one of her kind, she discovers theirs a dark side to her people’s past.'
(spelling mistake there ain't mine)
SOURCES: #1, #2
Have you recovered from the midseason finale yet?