Casper FFG, or hybrid Proof of Work (PoW) / Proof of Stake (PoS) Casper is at the second stage of testnet, Buterin said. Totally ready for Geth/Parity to start implementing.

The verification process would take around 5 and a half months, Danny, an eth dev, said. It started around mid-march, he said. There has been solid progress, daily.

15 thousand is too optimistic to be true.