This issue is a variant of Green Lantern (DC, 2011 series) #11. There exist further variants.
Combo pack is polybagged with redemption code for digital download of the issue.
Rated T Teen
DC shows another 28 cover previews of #0 issues being released in September 2012.
Ian Sattler encourages everyone to check out www.dccomics.com for more San Diego Comic-Con coverage.