Yesterday, EA Sports confirmed through their blog that the Madden NFL 13 demo will be available on Tuesday, August 14th.
The demo will give a preview of the new gameplay and presentation mechanics made to the title, as well as the ability to experience two Play now matchups. Both of those games can be previewed in the videos below:
Madden NFL 13 releases on August 28th for the Xbox 360, Playstation 3, Wii, and Playstation Vita. A Wii-U version will be announced at a later date.