According to the release notes, the new AMD Radeon Software Crimson Edition 16.3 drivers bring a couple of new Crossfire profiles, including the one for Square Enix's new Hitman game as well as The Park, an FPS psychological horror adventure game from Funcom.

In addition to the new Crossfire profiles, there are also several performance improvements including up to 60 percent improvements on Radeon Fury X series graphics cards and up to 44 percent improvement on the Radeon R9 380 series graphics cards in the new Gears of War Ultimate Edition, which was a disaster on Radeon graphics cards earlier. The performance improvements list also include up to 16 percent improvement in Rise of the Tomb Raider on Radeon Fury X series graphics cards.

The new drivers also bring a couple of resolved issues including fixed sustained clock speeds as well as issues seen in Gears of War Ultimate Edition, XCOM 2, Rise of the Tomb Raider and Ashes of the Singularity 2.0 Benchmark.

What makes the new Radeon Software Crimson Edition 16.3 drivers quite interesting are several new features, including Vulkan API support, per-game Display Scaling, new Language Menu for Radeon Settings, Two Display Eyefinity feature, Crossfire Status indicator, Power Efficiency toggle and updated Social Links in Radeon Settings home page. The list of new features also include preliminary support for AMD XConnect technology, which is apparently the name for AMD's external GPU technology, and now includes support for those external graphics cards with Radeon R9 300 series GPUs over Thunderbolt 3 connection.

The new AMD Radeon Software Crimson Edition 16.3 drivers are available for Windows 7, Windows 8/8.1 and Windows 10 in both 32-bit and 64-bit flavors and support all graphics cards since the days of AMD Radeon HD 7700/HD 7900. 

You can find both the new AMD Radeon Software Crimson Edition 16.3 drivers and the full release notes at AMD's drivers support page.