These images purported to be "rejected concept designs" for the Legendary Pictures/Warner Bros. Godzilla are making the rounds over the Internet.
Sites such as Shock Till You Drop, Dread Central and others have posted articles proclaiming that these are "the real deal" and, also, citing G-Fan as the source.
From Dread Central:
The images popped up in the latest issue of G-Fan. It should be noted these concepts were rejected, but at least they offer insight into which direction they're looking to go. Thankfully it's the right one!
Unfortunately (or fortunately, depending upon one's point-of-view), the images are fan-art drawings. They are not rejected concept drawings.