Some leaked documents from WhatsApp seem to show that the popular messaging service could be working on native Windows and Mac desktop apps.
The documents come from the WABetaInfo Twitter account, which posts information on upcoming WhatsApp builds and releases. In this case, the screenshots, which come from an unidentified source. seem to show download buttons in the works for Windows and Mac versions of WhatsApp.
While these images have not been confirmed as coming from WhatsApp, it's certainly not outside the realm of possibility that the service would be developing Windows and Mac desktop clients as they have been very open on releasing apps for a variety of platforms. Hopefully we will have more concrete information on this soon.