Too Long; Didn't Read
<strong>ETH2.0 is the planned replacement for Ethereum.</strong> Over the next several years, ETH2.0’s designers intend to completely subsume Ethereum’s consensus system and state altogether. With such a broad scope, we can’t say precisely what ETH2.0 will or will not include. We do have a few specs, and quite a few teams working on early implementations. At this point, the ETH2.0 designers tentatively plan to include sharding, Casper, state rent, and an eWASM VM. Initial client testing is underway, and a feature-light ETH2.0 testnet is expected to launch <a href="https://medium.com/prysmatic-labs/ethereum-2-0-development-update-19-prysmatic-labs-d4767f0bd6d7" target="_blank">within three months</a> (Q1 2019). At first, ETH2.0 will source its Ether (but not its security) from the main Ethereum chain, but designers eventually plan to invert the relationship by making ETH2.0 the main chain, and Ethereum 1.X a shard chain under its management.