GSU was one of my first choices too, and I feel really desperate after some people said they have received an invitation email in the morning...🙁
But when I check my application status, some requirement is incomplete although I sent the required materials more than two months ago, and the lady in the Graduate Services Office said if the the application is not processed by the Graduate Office, it will not be sent to the department for review. And my application status is the same as yours, No Decision At This Time. Can I ask you whether your application status is complete? I can't give up hope too..