Strange that the company did not inform the general public in a big way concerning this, but instead they went about it silently without much fanfare at all. No idea on why the higher number was disclosed after the initial announcement, but according to the New York Times, said revelation came about after Connecticut’s attorney general and several other state regulators opened investigations into the breach and started to probe with more questions concerning the entire hack.
Guess the additional 150,000 people or so are now affected, so it is best to change your account password just to be on the safe side.