Marvel has released images for two of the Avengers World #1 covers, scheduled for January shipping:  the standard cover by John Cassaday, and the wraparound variant by Art Adams.   

Click either image for larger view.

The new series, announced at New York Comic Con (see "Marvel Announces a Bunch of New 'Avengers' Titles"), flows out of the events of Infinity.  It will give greater prominence to newer Avengers such as Hyperion, Smasher, Cannonball, Shang-Chi, Starbrand, and Sunspot, while still drawing from the available 18+ members of the team. 

Cassaday cover
In the post-Infinity storyline, Earth has been marked an "Avengers World," because it is under the protection of the team.