It's not a renaming. They're basically just saying that ETH 2.0 as a concept typically used for versioning is not technically correct. There is just Ethereum, and there's various proposals and upgrades in the pipeline for years worth of development. ETH2 was supposed to symbolize the upgrade to proof of stake and the merging of the POW chain with the POS beacon chain. I think it may have encompassed the implementation of sharding as well. But since Ethereum is a living protocol, with many different upgrades and improvements to implement, I think it's more accurate to drop the versioning idea and just explain the different components and features as they go. The next major upgrade for Ethereum will be The Merge, which merges the Proof of stake consensus layer with the proof of work execution layer. It's expected to happen this summer. Afterwards, Ethereum will no longer run on GPUs, you'll be able to run a full node on a Raspberry Pi.