The video shows some footage of the photoshoot as well as the behind-the-scenes footage for their CM filming. Several items of 7-Eleven merchandise was shown, and amongst them were a few Girls' Generation's customized products. The prizes for the 7-Eleven campaign lottery were featured alongside the other merchandise. More details about the lottery can be found here. On a side note, Sunny mentioned that the first CM will be released later on today so keep an eye out for that.
This event is a special campaign by 7-Eleven Japan and features Girls' Generation and TVXQ. Check out their first 7-Eleven campaign BTS video below.