According to the release notes, the new Radeon Software Adrenalin 2019 Edition 19.4.2 driver promises up to 24 percent performance improvement for World War Z and it is a game ready driver for Ubisoft's Anno 1800 game. While there are no performance details for Anno 1800, AMD does say that the latest driver will boost performance by up to 24 percent in World War Z on Radeon VII and by up to 19 percent on RX Vega 64 graphics card.
It appears that AMD did not fix any bugs as the release notes only list known issues, which include some screen flicker in multi-display setups with Radeon VII, flickering with Netflix from Windows Store on HDR-enabled displays, performance metrics issues, and system instability SUS TUF Gaming FX504 laptop when a wireless display is connected.
The Radeon Software Adrenalin 2019 Edition 19.4.2 driver is available for 64-bit versions of Windows 10 and Windows 7 OS, and supports all graphics cards since Radeon HD 7700/HD 7900 as well as AMD Ryzen and other APUs.
You can check out the full release notes as well as download the latest driver from AMD's support site.