If the information published by cnmo.com is correct, the Galaxy S6 has the model number SM-G925F.
It will sport a 5.5-inch QHD (2560x1440) display with a 20-megapixel rear camera and a 5 megapixel front camera. Under the hood, it is driven by a Samsung Exynos 7420 (Octa-core 64-bit) and an ARM Mali-T760 GPU. It packs 3GB of RAM and 32GB internal storage.
Of course, it runs Android 5.0 Lollipop.
The Galaxy S6 had previously been rumoured to pack a Qualcomm Snapdragon 810, but recent reports of an overheating and speed problem with the AP led to speculation that Samsung would use its own Exynos option instead. Other reports predict a Snapdragon 810 model will come later.
Source: cnmo.com (via: BGR)