Ethereum is expected and on track so far to get another update at the end of June. Specifically June 30th 2019.
This update is one of the biggest moves from POW to POS and will be called Phase Zero. This update will also include a massive rework of Ethereums blockchain called Ethereum 2.0 this will change how Ethereum generates and validates new blocks.
Ethereum 2.0 Will have 2 major flagship components.
Casper - Proof-of-Stake algorithm which will replace mining
Sharding - Massive Scalability improvement - This will be done by not requiring every computer on the network to validate the transaction