Regarding the free trial week being offered by WWE starting tomorrow for the WWE Network, it will work in a way that other subscription based models do. You will be required to sign up with credit card information and your subscription will automatically renew unless it is canceled. Sign ups for the WWE Network will be available starting tomorrow morning (2/24) at 9:00 a.m. Eastern (8:00 CT).
For more on the WWE Network launch on Monday, click here.
Source: WWE.com, The Wrestling Observer Newsletter