I've self-assigned these two release notes, but want to make sure I've got the most important points for each.

Change: Make btrfs the default file system for Fedora Cloud
Release notes: https://pagure.io/fedora-docs/release-notes/issue/702

In this release:

• Reflink and snapshot support; overlayfs automatically will use reflinks for copy-up operations, making container operations more efficient and performant; it is an option to use the native Btrfs driver in-lieu of overlayfs;
• Metadata and data integrity checking enabled by default, for every read;
• Adds the ability to logically separate contents of the volume without dividing up the available space: currently Cloud edition images use the same subvolume layout as Fedora desktop variants. But it's straightforward to make adjustments post-install, and to enhance image creation tools;
• Zstd compression is enabled out of the box;
• All the features Btrfs has to offer are opt-in. They aren't in your way if you don't need them, but are there if you do, all under one command interface.
• Using Fedora Cloud images on RHEL with libguestfs container (needs some minimal documentation to include in release notes and the feature page)
  https://src.fedoraproject.org/container/libguestfs

Future features:

• More complete resource control picture by including IO isolation;
• Performance improvements by extended CoW capabilities to package management;
• Native fscrypt support: per directory and subvolume encryption;

Change: Build Fedora Cloud Images with Hybrid BIOS+UEFI Boot Support
https://pagure.io/fedora-docs/release-notes/issue/703

• Fedora Cloud Edition images seamlessly boot either BIOS or UEFI firmware, on baremetal and virtual systems;
• Images exclusively use the UEFI specification's GUID Partition Table (GPT) format;
• Facilitates easier migration should (in particular) virtual hardware change firmware type from BIOS to UEFI;
• Better aligns the layout with:
  • other Fedora editions including alternative architectures;
  • how COSA, KIWI, and OSBuild build images;
  • and how other distributions use GRUB, as well as GRUB upstream.