Apparently Boeing knew about the problem earlier than they have previously admitted, according to the Beeb. Referring to the article's mention of the "Angle of Attack (AOA) Disagree alert" I must say this passage puzzles me:

The planemaker said it had intended to provide the feature as standard, but did not realise until deliveries had begun that it was only available if airlines purchased an optional indicator.
Are they suggesting that the left hand doesn't know what the right hand was doing? Whatever, it's looking pretty bad for Boeing.