The first v4 testing ISO is now out!
Quoting Rudra on Discord:
Aside from it being declarative and atomic, it now has a dedicated first-setup app that allows you to create users following the installation of the system, unlike previous iterations where it was a part of the system installer. It ships with GNOME 45 out-of-the-box, but just like with the alpha, you can change the desktop environment in the /system.yaml file and update your system from the 'System' app. The default GNOME dash is a lot less cluttered now (new default-gnome track). You can also include any custom packages or even build your own system with your own packages, giving you a nearly vanilla Arch Linux installation but immutable and atomic!
We've now implemented three-way /etc merges (similar to ostree), therefore making /etc mutable and allowing you to edit package configuration. Similarly, /usr/local too is now mutable so that you can install any themes or custom-built applications system-wide.
This is still a beta release, so not everything is finished. There are no system or user tools anymore, and the default DE is GNOME (this can be changed post-install).
You now have to use system.yaml, so follow my post-install guides here: https://asterisk.lol/blog/blend_v4/#post-install (soon to be on the new docs)
If you'd like to download it, you can get the ISO from the following mirrors:
You can also get torrents for it from our FossTorrents page: https://fosstorrents.com/distributions/blendos/#downloads
Also, another reminder is that this is still a testing release. Things are unfinished!