Samsung I9506 Galaxy S4 with Snapdragon 800 surfaces
Samsung Galaxy S4 is currently available in two variants internationally - with Snapdragon 600 and Exynos 5 Octa internals. There's another version, the Galaxy S4 LTE-A, which launched in South Korea with a Snapdragon 800 chipset and LTE-Advanced connectivity.
Higher is better
This is actually better than what the South Korean version of the phone managed. The Adreno 330 GPU easily outperforms the Adreno 320 in the Snapdragon 600, too.
Unfortunately, there is no official word from Samsung on the upcoming variant of the Galaxy S4 smartphone. And until an official announcement comes, you will do well not to get your hopes too high.
Source (in Japanese)