Glyph of Smite has been an almost mandatory glyph for Disc Priests who use Atonement healing as a significant portion of their overall healing. While we saw Atonement nerfed by 10% on PTR, the bigger news is the nerf to Glyph of Smite.
On 5.3 PTR, the Glyph of Smite has been updated to:
Your Smite spell inflicts an additional 20% damage against targets afflicted by Holy Fire, but that additional damage does not get transferred by Atonement.
The original glyph was:
Your Smite spell inflicts an additional 20% damage against targets afflicted by Holy Fire.
So this is technically a huge nerf to Disc Priests, even if it isn’t wrapped up in a huge nerf to Atonement itself. And Discs will be digging into their glyph books to decide what should replace it.
Ghostcrawler also weighed in on the changes: