The linux-firmware package 20220119.0c6a7b3-2 implements kernel
firmware compression. Linux kernel from 5.3 on support loading
from xz compressed firmware.
CONFIG_FW_LOADER_COMPRESS kernel option must be enabled. All official Arch Linux kernel support this for a long time. 
The linux-firmware package has been split into smaller packages to
further reduce required disk space. Some big firmware files of
rarely used hardware have been split into separate packages.
This affects firmware for Mellanox Spectrum switches, Marvell devices,
Qualcomm SoCs, Cavium LiquidIO server adapters, QLogic devices,
Broadcom NetXtreme II 10Gb ethernet adapters.
Make sure to install additional firmware packages if needed. 
 FS#72559 +
The libxml2 package prior to version 2.9.12-6 was missing the compiled python modules. This has been fixed in 2.9.12-6, so the upgrade may need to overwrite any untracked pyc files created. If you get errors like these
libxml2: /usr/lib/python3.10/site-packages/__pycache__/drv_libxml2.cpython-310.opt-1.pyc exists in filesystem
libxml2: /usr/lib/python3.10/site-packages/__pycache__/drv_libxml2.cpython-310.pyc exists in filesystem
libxml2: /usr/lib/python3.10/site-packages/__pycache__/libxml2.cpython-310.opt-1.pyc exists in filesystem
libxml2: /usr/lib/python3.10/site-packages/__pycache__/libxml2.cpython-310.pyc exists in filesystem
when updating, use
pacman -Syu --overwrite /usr/lib/python3.10/site-packages/__pycache__/\*
to perform the upgrade.
libxcrypt 4.4.21, weak password hashes (such as MD5 and
SHA1) are no longer accepted for new passwords. Users that still have
their passwords stored with a weak hash will be asked to update their
password on their next login.
If the login just fails (for example from display manager) switch to a
virtual terminal (Ctrl-Alt-F2) and log in there once.
As some of you may have read over the past days, there has been an ownership dispute over the freenode.net network. The IRC network has been used by Arch Linux and many other projects over the past decades as a platform for discussion and support.
The dispute led to the exodus of most former freenode staff from the network and the founding of a new network: libera.chat
Starting today, Arch Linux and its sister projects Arch Linux ARM and Arch Linux 32 will begin migrating the official IRC channels from freenode.net to libera.chat. Please bear with us as this can …
The installation medium now provides a guided installer.
This addition to the default method of installation (based on the installation guide) is similar to the other methods.
If you use this installer, do not forget to mention it when asking for support and also to provide the archinstall log, when asked.