Dell is announcing a pair of consumer monitors at this year's CES. Each SKU uses an HDR-ready IPS panel, which covers over 85% of the DCI-P3 color space and does so with up to 600 cd/m2 peak brightness. As far as I can tell, the only technical difference between the panels is that the 24-inch one has a 1080p resolution, while the 27-inch one has a 1440p resolution.
As for a possible difference: the 27-inch is also listed as being VESA certified DisplayHDR 400, which means that it will provide at least 400 nits of brightness in HDR content. I’m not sure why the 24-inch is not listed as DisplayHDR 400, because it has the same backlight, but that could be something as simple as “one finished the certification process before the other”.
Regardless, the main features of this monitor is that it’s bright, it’s thin, it has a thin bezel, and it is HDR-ready. If that is what you’re looking for, then consider these monitors when they launch on February 6th. The 24-inch (S2419HM) has an MSRP of $299.99 while the 27-inch (S2719DM) has an MSRP of $499.99.