The Material Design Icons' site and webfont has gone into beta. Development will continue as normal, but at this point the icon set and features should be production ready.
In the beta the goal will be to address bugs as they come in as people start to integrate the icons with their projects.
Thanks for all the support during the development.
Note: There are many icon requests that are being processed. This is not a first come first queue, and it could take a while to process all the icon requests. If an icon is rejected it may still be created and attached to the issue.