1.) I don't think Coderus is working on wazapp nightlies anymore. He has his own whatsapp app now, Persecute. You should check it out.

2.) Not to sure on the community updates for the N9. Personally, I doubt it. If you want community updates, you want the N900.

3.) I personally feel that the N9 is showing its age. More so when it comes to API changes etc then hardware. So I guess this is a matter of opinion and one that will be greatly divided.