This has only been in discussion since it was shown on MMOChampion. You're continuing a very useless argument that you are just now either apparently deciding to show, or have just now gotten to reporting on it. While Goblins make slight sense as to joining the Horde, Worgen in the Alliance do not. The Alliance is full of prejudice, and tradition. If you haven't noticed, they have a very easy to anger king at the head of the humans, who also happens to front most of the Alliance diplomacy.
Worgen come in two breeds as far as I know, human based ones who transform, and those who are, and always have been in the form of a worgen. How would they tie this in? The Draeni was enough of a stretch, do you honestly believe that they would go and try to justify the addition of the Worgen? It would be pretty outrageous.
To the masks themselves, they added a few more. Could be them just covering it up, considering the new mask were lower quality textures. Halloween was due for some tune up in the mask system, so that could also be just as justified.
On another note of Goblins. Goblins in the Warcraft universe are businessmen, masters of engineering of anything with a boom, and very crafty. They don't really pick sides, Goblins have been neutral, helping those would do so for a price most times.
Some people need to stop treating this article like it has much real relevance to the game, especially about an unannounced expansion pack.