Since I didn't see the changes in the announcement, here is a copy pasted changelog from the NEWS file:
New in 2.14:
* libgcrypt 1.11.
* LVM LV integrity and cachevol support.
* EROFS support.
* GRUB environment block inside the Btrfs header support.
* NX support for EFI platforms.
* shim loader protocol support.
* BLS and UKI support.
* Argon2 KDF support.
* TPM2 key protector support.
* Appended Signature Secure Boot Support for PowerPC.
* New option to block command line interface.
* Support dates outside of 1901..2038 range.
* zstdio decompression support.
* EFI code improvements and fixes.
* TPM driver fixes.
* Filesystems fixes.
* CVE and Coverity fixes.
* Tests improvements.
* Documentation improvements.
* ... and tons of other fixes and cleanups...
