Here is a quick Video Demo of the Wazapp Client for Nokia N9 (N950).
Wazapp is a community port of the famous Whatsapp client. This is still in development so please ignore any glitches you see in the demoed version
So it is being worked on and it does exist, but still no news with regards to a public release. Official Website http://www.wazapp.im. Thanks for the Tip @msullx