The new version of Librebot was just released which brings new hardware compatibility and tons of great improvements. I am excited to update my Lenovo x200s and will make sure to update this post with a quick overview of my experience.
This is one of features that really popped out for me:
256MiB VRAM allocated on GM45 (X200, T400, T500, R400) instead of 32MiB. This is an improvement over both Lenovo BIOS and Libreboot 20150518, allowing video decoding at 1080p to be smoother. (thanks Arthur Heymans) To clarify, GM45 video performance in libreboot 20160818 is better than on the original BIOS and the previous libreboot release.
They also improved battery life across multiple models.
You can read all the changes here and download the software from their website.
The upgrade was really straight forward and worked great on my x200s. Anyone who has already flashed a laptop will already know everything they need to upgrade.
The guide can be found here. Make sure to merge your MAC address into the rom before upgrading.
A bugfix version, 20160907, was released on 2016-09-07. It does not contain any board changes, but make sure to use the latest one while upgrading.