coreboot 4.9 has been released. There are lots of changes, but the project does a great job summarizing the changes in their announcement:
[…]In the little more than 7 months since 4.8.1 we had 175 authors commit 2610 changes to master. The changes were, for the most part, all over the place, touching every part of the repository: chipsets, mainboards, tools, build system, documentation. In that time we also had 70 authors made their first commit to coreboot.[…]
https://blogs.coreboot.org/blog/2018/12/20/announcing-coreboot-4-9/