It's a sweet, spicy sauce with notes of ginger and garlic, plus Sriracha chile sauce and crushed red pepper for heat. The sauce was first introduced in fall of last year for limited-run. Apparently, it sold well enough that they're bringing it back this year.
Spicy Korean Q is available through November 26, 2016. You can get it as a sauce on both boneless and traditional wings.
Photo via Wingstop.