The development and testing is slow and steady. Release next year ?
They don t release before March investors will wait for the Constantinople ETH fork later this year. The Casper update makes ETH a PoW / PoS hybrid like peercoin.
PoW2 might be a better concept but people won't care if they can earn interest with ETH.
The dev team need to get on with it , it's been too long waiting for the update.