The government is expected to make a major education announcement tomorrow.
It has been consulting on class sizes since January, including the possibility of removing caps for kindergarten and primary grades.
Ontario's deputy education minister also sent school boards a memo earlier this month recommending school boards freeze hiring ahead of an update from the minister by March 15.
The heads of the elementary and high school teachers' unions say they've been told an update is coming but don't know what to expect in terms of details.