SerenityChain.com
SerenityBlockchain.com
From Ethereum founder:
"Serenity is a new blockchain in the sense of being a data structure, but has a link to the Proof-of-Work (PoW) chain. The Proof-of-Stake (PoS) chain would be aware of the block hashes of the PoW chain, you’d be able to move eth from the PoW chain to the PoS chain."