From what the vague specs say.. this could possibly be a 4k 120hz monitor
"Smoother Gameplay
The rapid 144Hz screen refresh rate minimizes image lag and motion blur for smooth gaming, while user-friendly 60Hz/120Hz settings let you optimize monitor performance, on-screen display, without having to adjust it each time in the display setting menu."
The description lists it as a 2560x1440p 2k monitor on the product page 
Damn I was hyped.
EDIT: Actually from the rest of the specs, it still looks like it might be the best FreeSync 1440p screen out, so not bad actually
"The Samsung C49HG90 is the company’s first ultra-wide display with the 32:9 aspect ratio and the so-called double full HD (DFHD) resolution (3840×1080). The monitor is based on a VA panel with up to 600 nits brightness, 1 ms moving picture response time (MPRT) as well as a 144 Hz refresh rate, two features important for fast-moving games. The panel has 1800R curvature along with 178° viewing angles to make gaming experience more immersive. The smaller C32HG70 and C27HG70 monitors use 32” and 27” curved VA panels (respectively) with a 2560×1440 resolution as well as the same refresh rate and MPRT as on the flagship model."
http://www.anandtech.com/show/11530/samsung-announces-chg70-and-chg90-freesync-2-monitors