The gift card you get will depend on the store you shopped at. Walmart, Walgreens, and Office Depot receipts will all get a gift card to the store you shopped at. Any other store receipt will get you a $5 Visa gift card back.
According to their website you should get your reward within 3 weeks. Note, it is a limit of one reward per household.
Beginning 7/23 at Office Depot you can grab this deal:
Buy 4 Zebra Z-Grip Retractable Ballpoint Pens, 7 pk, $3 each when you buy 4 $12
Submit for $5 Rebate
Final Price: $7 for four packs!