WhatsApp is a software so to get more people onto Whatsapp, they're expanding their software support to all the available phone platforms... I dont think they can only be focused on WP8 or Neglect WP to go for Asha in particular. They have developed a pretty decent(still some bugs like crashing a few times, etc) WP8 software version now in WhatsApp compared to what it was a few months back(the previous version was totally unstable and had a huge audio API bug which was draining the battery all the time). Now they have optimized it. Anyway, to renew Whatsapp, go to the software, go to Settings-> Swipe left/right to go to "Account" tab. At the bottom of the page, there is a "purchase service" or "email purchase link" .