How would you know that they wouldn't? Anything is possible as long there isn't any solid printed specsheet. Did you ever heard that prototype can change from the day that it was made to the day of production? That's why it is called Prototype! things can be changing until finalised and announced.
Over a year ago!!!!!!! You've said it yourself. 1year ago f Nokia said N9 will be ARM11 would you still saying that N9 still running ARM11 now?
Hardware spec do change from the time it is planned, I personally think that you can't just take the rumour one year ago too seriously.
After all Nokia said N9 will be Maemo6 now Maemo6 is becoming MeeGo. It didn't stay as Maemo6, even the OS name can be changed and they said alot of thing about N900 and promises but in the end they dropped the balls.