IGN:
The CW has yet to officially renew any series for next season, though there are obviously a couple of no-brainer decisions – as it’s certain their two biggest series, The Vampire Diaries and Arrow, will be back.

It’s also assumed Supernatural is most likely returning. Despite being in its eighth year, the series is one of the network’s best performers and its move to Wednesday nights this season, paired with Arrow, has been a successful one. (Mark Pedowitz, Nikita, Supernatural, The CW, TV)