From all that I've read online, there seems to be a fair amount of confusion involved when Ethereum community members ask about the changes scheduled for Ethereum 2.0. There are a few 'major' feature changes & functionality implementations scheduled to take place in the near-future of Ethereum.
For an overview, you can refer to these FAQs.
Work on the upcoming Ethereum 2.0 (scheduled to begin this Summer) will introduce, amongst other things, the switch from the Proof of Work (PoW) consensus mechanism to Proof of Stake (PoS).
Essentially, both PoW and PoS are alternative algorithmic solutions to the task of creating / validating Blockchain blocks. Proof of Work is the paradigm used by Cryptocurrencies such as Bitcoin, Litecoin, ZCash, and currently; Ethereum.