Amazon.com has posted the 2014 WWE SummerSlam DVD cover art, and it features both Brock Lesnar and John Cena.
While not confirmed, this could be an indication that the main event of the show will be Cena vs Lesnar for the WWE World Title, making it likely Cena will win at Money in the Bank.
If nothing else, it all but confirms Lesnar will be competing at SummerSlam this year in some form: