Newegg had accidentally leaked the visiontek RX 480 on their website, however it has been pulled. The good thing is that people managed to quickly take snaps of the online store showing the RX 480 (Below)
As you can see the core clock is a nifty 1120Mhz and the boost clock is 1266Mhz however there wasn't any spotting of the 4GB version of the RX 480. It's not long now until the RX 480 will be released as many gamers are anticipated on getting their hands on a budget but powerful graphics card.
-Core Clock 1120Mhz
-Boost Clock 1266Mhz
-1 x HDMI 3 x Displayport
-2304 (36CU) Cuda Cores 2304 Stream Processors
-PCI Express 3.0 x16