Quoting LinuxJournal:
“[…]GRUB 2.04-rc1 has been released. Phoronix reports that after nearly two years of development, this release will bring tons of changes, including “supporting multiple early initrd images, support for the F2FS file-system, a verifier framework, RISC-V support, UEFI Secure Boot shim support, Btrfs Zstd improvements, Btrfs RAID5/RAID6 support, Xen PVH support, UEFI TPM 1.2/2.0 support, and a lot of other work.[…]”
http://git.savannah.gnu.org/cgit/grub.git/
https://www.phoronix.com/scan.php?page=news_item&px=GRUB-2.04-Release-Candidate
Firmware Security 