Innovations are known for Metropolis:

Anonymity – "Zero Knowledge Proofs" (zk-snarks) will allow the Ethereum Blockchain to perform anonymous transactions on a higher level in the future.

This is like Zcash. Ethereum chief developer Buterin and Wilcox work together on Zcash's anonymity.

Metropolis upgrade provides easier programming for programmers.

* Smartcontracts should also be simplified.
* Gas is to be adjusted when a transaction is executed, to settle the bill and thus save costs.