So far we have only seen one enigmatic tweet from WhatsApp suggesting their extremely popular IM app was coming to Windows Phone 7.
Now Plaffo.com managed to find an image on their server named teaser.jpg clearly showing the Windows Phone 7 logo.
Despite WhatsApp wanting to tease up I think the cat is now clearly out of the bag.
See the picture on WhatsApp’s server here.
Via Plaffo.com