The specs are expected to be the same and the live pictures below confirm it - the device is running on a quad-core 1.9GHz processor with Adreno 320 GPU, which most definitely means a Snapdragon 600 chipset. The screen supposedly has the same size and resolution as the original Galaxy S4 - a 5.0-inch 1080p unit, though it's unclear if it's a Super AMOLED one or not. Strangely enough, the reported pixel density of the phone is 480ppi, so the display might actually be smaller.
The device is said to have a 8MP rear camera, down from the 13MP camera in the original S4. It has a metallic shell with bolts on the back and three hardware buttons below the screen.
Notably, Samsung is also preparing to release another version of the S4 dubbed the Galaxy S4 Zoom. This version is said to feature a 16MP camera with optical zoom.
With multiple versions of its flagship device, Samsung continues to compete against the iPhone by trying to capture as much market share as possible. It currently ships 41.1% of all Android phones which accounted for 75% of the smartphone market in 1Q13. iOS accounted for 17.3% of the smartphone market in 1Q13. Apple is not expected to unveil a new device until this fall.