In a short and to the point post on Toolband Blair confirmed the Big Day Out dates for Tool, however has made no mention of any side shows:

BIG DAY OUT FESTIVAL DATES

Jan 21 – Auckland
Jan 23 – Gold Coast
Jan 26 – Sydney
Jan 30 – Melbourne
Feb 4 – Adelaide
Feb 6 – Perth

I still expect sideshow to be announced, the question is when.  As soon as I know you’ll know…