And? Well, we've had the Warcraft 3 image in Bnet for over half a year and still no announcement on the trilogy remakes. Just because an image is in the Bnet client neither proves or denies anything. People keep speculating that alpha will be in March/April but I think we won't even see the first invite wave until well after summer.
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Also, keep in mind that the Hearthstone image was added to the launcher way, way back before it even entered beta, right after it was announced in March 2013.