The indicia says monthly but the editor afterword says "every two months".
This issue is a variant of Carnage (Marvel, 2010 series) #1.
There exist further variants:
Spider-Doppelganger (also in flashback); Michael Hall (introduction); Iron Man [Tony Stark]; Pepper Potts; Spider-Man; Captain America (cameo flashback); Venom (cameo flashback); Demogoblin (cameo flashback); Shriek (also in flashback); Royal Blue (introduction); Firebrick (introduction); Dr. Tanis Nieves (introduction)