Minecraft Java Edition 1.17.1 was released yesterday, and the network has been updated to allow connections from this new version. The servers themselves still run 1.16.5 and you are encouraged to stick to that version for now. Bedrock players, no changes no report.
Work on the actual update to 1.17 is progressing, but not quite ready yet due to compatibility issues with at least one plugin. I'm hoping to be able to see that through soon.