According to the release notes, the new Radeon Software Crimson ReLive Edition 16.12.2 drivers mostly focus on fixing bugs with first 16.2.1 ReLive drivers, including failed installation on some system configurations, issues with Radeon Settings as well as issues with the ReLive component.
The drivers also fix performance problems with Borderless Fullscreen application support with AMD FreeSync in certain scenarios, flashing or corruption in Battlefield 1 on Radeon RX 400 series, problems with DOTA 2 while recording with Radeon ReLive in AMD Multi-GPU configurations and problems with Chromium.
There is also a list of known bugs for both drivers and the ReLive component which will probably be fixed with the next major driver update.
As always, the new Radeon Software Crimson ReLive Edition 16.12.2 is available for Windows 10, Windows 8.1 and Windows 7 in both 32-bit and 64-bit version and links for download can be found inside full release notes on AMD's support page.