Few questions about ethereum POS

[jameshowlett]

1. When will Ethereum officially change to POS?
2. So can we mine ethereum anymore?
3. If not, what will happen to ethereum, how can we mine it?
4. Tell me your prediction about the price after activating the POS

Thanks for reading my post

[Agrello]

As written by vitalik:

"After three years of trying to find solutions to the “nothing at stake” and “stake grinding” attacks, we have decided that the problem is too hard, and secure proof of stake is almost certainly unachievable. Instead, we are now planning to transition the Ethereum mainnet to proof of authority in 2018. To that end, we have launched two new testnets, Qinghuadongluxikou and Hongqiao Airport Terminal 2, to test our latest proof of authority specification."

https://github.com/ethereum/EIPs/issues/225

"For those not aware of how PoA works, it's a very simplistic protocol, where instead of miners racing to find a solution to a difficult problem, authorized signers can at any time at their own discretion create new blocks."

Original write up:
https://ethereum.stackexchange.com/questions/13968/are-miners-eliminated-in-proof-of-authority