Do not expect a miraculous uptick in visual quality -- these beam tracing effects only use to WOW TBC Classic Gold shadows, and that means you're simply going to see a softer, more realistic regions of darkness when you are using this choice. This doesn't revamp the game's whole lighting model, so you won't get as transformative an effect as in, say, Minecraft's RTX implementation.
If you have been having difficulty getting Shadowlands' ray-tracing to kick on, Blizzard's got any help on the official forums. You'll need a GPU that supports ray tracing tier 1.1, with the latest drivers, as well as the May 2020 update for Windows 10 -- also, of course, you ought to be using DirectX 12.
As announced earlier this week, the GeForce 452.06 driver provides added support for the WoW Shadowlands beta. You can head into the Blizzard site to opt-in for a chance at beta accessibility, too.
The folks at Wowhead have caught a load of contrast shots to reveal what people ray-traced shadows seem like. It's a pity WoW ray tracing won't go past shadows for now, since the stylised design and simple character models would look incredible beneath the spotlight of extremely realistic light.
Blizzard first detailed Shadowlands in Blizzcon 2019. The expansion includes five brand new zones for players to explore, a revamped leveling system which compresses the old one to 60 levels and new personalization options, including the option to modify the sex of buy TBC Classic Gold your character without paying a commission. The short centers on a familiar face from the Warcraft world: Uther.