Up till today we haven't seen any authentic image or render of Samsung galaxy s5. I wrote up till today because Amazon has leaked images of different variants of Samsung Galaxy S5.
Amazon didn't actually leak images but showed Samsung Galaxy S5 in protective casing which they are selling right now. These images show two variants of the device. One with physical home button and one without it. A previous leaked confirmed that the Samsung Galaxy S5 will indeed feature a fingerprint scanner which will be integrated in physical home button of the device. The one with no physical button might not feature that feature or just have it, relocated at some place else, may be at the back like we have seen in HTC One Max.
Anyhow see the images and decide for yourself.