The display standards body VESA has rolled out a new 1.2 spec for its DisplayHDR certification regime. The revised Version 1.2 standards add a range of new requirements, but the bottom line is that most so-called HDR-certified monitors still won't actually be HDR capable.
In theory, VESA is slightly raising the bar for what it takes to qualify as an HDR PC monitor. VESA has added requirements for colour fidelity and static contrast, for instance, particularly to the lower tier certification levels. However, the standards still allow for things like monolithic backlighting on LCD panels, which are not the stuff of true HDR performance.
