Samsung has included a robust accessory line for their new Galaxy SIV superphone, and one of the many doodads is a Bluetooth gamepad dock. It looks a bit cheesy, but if it is functional, it could be quite useful for heavy mobile gamers. They have a number of other accessories as well. Here's a link below to check out the gamut of stuff they will offer for their new flagship.
Thanks for the tip, CJM!
Source: Samsung SGS4 Accessories