It's been 2 months. In this time, we've fixed some minor bugs, moved the positioning of some buttons, and updated to Sodium 0.5 (on 1.20.1), the biggest release of Sodium.
We've also added dimension.properties, a new way for shader devs to support modded dimensions such as Twilight Forest! (Shaders must be updated to utilize this.)
https://github.com/IrisShaders/Iris/blob/1.18.2/docs/changelogs/1.6.5/full.md