AFAIK, ethereum was also supposed to reduce the block reward from 5 ETH to 3 ETH don't know if they have already done that or not.
As of the beginning of this year, the block reward of Ethereum was reduced by 33 percent. Now miners receive 2 ETH instead of 3 ETH which was the reward before. The block reward reduction in this case was introduced via a hard fork called Constantinople. Unlike BTC and LTC, ETH doesn't have a well defined havling schedule. In theory ETH could have unlimited supply, and I think the dev team is working to change this.