Here is the Sam’s Club Black Friday ad for 2013. They open at 7am on Friday. There will also be a few online only deals that start on Thanksgiving Day.
Also, the majority of the deals Friday will be available online. I have tried to note those as well. I remember last year the online offers sold out incredibly fast.
If you join as a new member, you can get a $40 gift card. Current members can upgrade to a Plus membership and get a $25 gift card.
Here are a few highlights from the ad and you can click at the bottom of this post for the complete ad scans.

how do you get the $40 gift card for a new membership?
How do you get the $40 gift card with a new membership at Sam’s Club?