Dear Britsimon , correct, but over one year waiting and follow some forums may be change the behaviors especially some kind of non-predict events some times changed to obsessive and compulsive behaviors in human kinds.NO!!!
Ready simply means they have marked the case as received. It is just a system update - nothing more sinister or meaningful than that.
You REALLY need to stop questioning every tiny detail. The insights into the information seem to be sending you into overthinking mode. You are going to make yourself sick. Please - relax and get ready for your interview.