Kane has scheduled a Thursday afternoon news conference in Harrisburg to discuss her decision.
Camelot Global Services' bid to take over lottery management from state employees expires Saturday. Republican Gov. Tom Corbett has pressed Kane, a Democrat, to say whether she approves of the form and legality of the 20- to 30-year contract.
In the meantime, the contract's legality is being challenged in court by Democratic lawmakers and the union that represents lottery employees.