Marvel is really getting behind this all new Marvel NOW! business—you can download the preview issue free from the Marvel Comics app and the Marvel Comics webstore.
The issue features a few samples of
Avengers World #1 by Jonathan Hickman, Nick Spencer and Stefano Caselli
All-New Invaders #1 by James Robinson and Steve Pugh
Black Widow #1 by Nathan Edmonsson and Phil Noto
All-New X-Factor #1 by Peter David and Carmine di Giandomenico
Thunderbolts 20.NOW by Charles Soule and Carl Barberi
All-New X-Men 22.NOW Brian Michael Bendis and Stuart Immonen
Savage Wolverine 14.NOW by Richard Isanove
source: comicsbeat.com by Heidi MacDonald