Hi Obiba,
Welcome to the Nokia Support Discussions,
Fring is a third party software, therefore Nokia sadly can't tell you when the application will be available. You could mention the lack of support for the Nokia N9 in the Fring support community.
Or simply ask them via email. The more interest there is for their product, the bigger the chance they could actually develop Fring for the Nokia N9.
John_Tesla
Nokia Support Discussions Moderator