My initial reaction was, "Whoa! That's not one of the kit leaks that I've seen over the past several months! Is the all-white kit real? If so, I'm ordering one for me and my two boys!" I've seen the leaks of the supposed red home kit, yellow away kit, and blue-striped alternate kit, all of which can be seen in the header picture at the top of this post.
Being a kit fanatic, I examined the picture for several minutes, and had to ask the question: "What's with the three different collars?"
Then it hit me: the three white kits modeled by Giroud, Arteta, and Cazorla aren't one kit. They're three completely different kits — three blank, white canvases, soon to be splashed with color.. And the correlating paint color behind each player will fill the kit he's wearing.
Remember the classic, red-and-white, round-neck home kit that we saw Thierry Henry modeling months ago? It had a round neck. Arteta's shirt (left in the picture above) has a round neck. The paint behind Arteta is red. Home kit confirmed.
Cazorla's v-neck, colored yellow? That matches the yellow and navy away kit we've seen leaked time and time again.
Giroud's kit is the most easily distinguished. Collar? Buttons? Strange seam in the middle? It looks like the somewhat odd, blue-striped kit is actually happening.
So there you have it. Arsenal's Puma post confused me for several minutes, but now the riddle is solved. All the leaks are 100% real. Now if we could just convince Puma to make that all-white kit an alternate for 2015/16...
(NOTE) Thanks to @ArsenalEdits for being a constant source of information for me and fellow Gooners.