Amidst all the hoopla coming from the San Diego Comic-Con DC Comics released the cover images for their October variant covers. Once again the theme is Halloween and monsters and both the main Green Lantern title and Sinestro are participating. The cover for Green Lantern #5 features work by Neal Adams while Karl Kerschl turns Sinestro into Gumpy Cat for Sinestro #13.
Source: Comic Book Resources