An Ethereum developer has opened an Ethereum Improvement Proposal (EIP) to discuss whether the community should modify its Ethash mining algorithm to maintain ASIC resistance.  The EIP is a direct response to reports that Bitmain — by far the largest manufacturer of mining rigs that use Application Specific Integrated Circuit (ASIC) chips — has developed an Ethash ASIC miner and will begin shipping them within the next several months.

- by the way the same proposal to change algorithm was for the SIA coin, after Bitmain launched it's miner.    But finally SIA decided not to do so.