From the article:
Destructoid reports that it has "obtained photographs" of a purported brochure advertising a credit card tied to the retailer's existing PowerUp Rewards program. Signing up for the card nets customers anywhere from 5,000 to 15,000 PowerUp Rewards Points (worth roughly $5 to $15 in value), according to the images, as well as benefits like "special financing offers." We'd expect that having a GameStop credit card would also provide Rewards Points for everyday purchases, but there's no mention of such a benefit in the report.
Those signup bonuses are… kinda weak. And of course, it has a ridiculously high APR
Again, this is all based on one Destructoid report, so who knows if it'll come to pass. It sounds like just the sort of thing GameStop would get into, though.
ETA: They really exist now. Thanks, Bezerker!