This one slipped through the mazes. The PG279Q is for people looking for a 27″ display with G-Sync. The new PG279Q is 27" in size and features a 144Hz capable IPS-type panel and NVIDIA G-sync support.
According to Asus it has "extensive connectivity" options including DisplayPort and HDMI connectivity. Remember we mentioned that there has been a revision to the GSYNC board supporting HDMI ? There you go.
very little to really no other specs and information have been posted, neither any other features - availability or pricing. This and other than that this is a WHQD screen with a screen resolution of 2560x1440. The press release seems to indicate that the screen will be part of the Republic of Gamers (ROG) brand, which makes total sense if you look at the design of course.