If you pre ordered anytime in July expect to be playing tomorrow, like no question would cancel any plans other then work or school.
Please don't spread this shit. Then someone will invariably get all self entitled and when they don't get in tomorrow they will cry endlessly because "Bioware screwed them over".
Also remember that there will be multiple waves of invites tomorrow. No idea about how frequent but don't abandon all hope at playing tomorrow if you don't get in at 7am.