FIRST told me they weren't certain an "official" communication would be forthcoming from them once they released the divisional information, so this may as well be the clearinghouse area as the "final" information is released.
It appears they have started the divisional assignment process per the overall list:
Overall List:
By Team Number:
https://my.usfirst.org/myarea/index....P&sort=teamnum
By Division:
https://my.usfirst.org/myarea/index....&sort=division
Championship Event Info:
http://www.usfirst.org/community/frc...nt.aspx?id=432
Sorting order appears to be Archimedes, Curie, Newton, Galileo - repeat....
Disclaimer - It APPEARS these are valid, but wait until the official Divisional Team Lists appear on the Championship Event Info page at the link above to be 100% certain.