The same Twitter account which posted an image of Instagram app listing on Windows Phone Store today tweeted that more big apps are coming to Windows Phone in May. The app list includes Instagram, Real Racing 3 and Temple Run. These apps/games are expected only in May. Windowsphoneapps.es is also reporting from a trusted source that Instragram and Zello, a popular Voxer alternative is also coming to Windows Phone 8 devices in coming weeks.
We are not sure about the authenticity of these rumors, just have it in your mind that these apps may come to Windows Phone sooner than expected.
Source: Anon Tech leaks