I believe that; if the game was selling around or above the expectations, we would have already been informed about it via some kind of pr statement about pre-orders or first week sales and such.
Therefore; the numbers must be within the limit of the previous games. Probably higher than those but not anywhere near expectations.
The sales trend after the first 3-4 weeks will most likely be decisive as we have witnessned with the previous installments. While DA2 seemed to nose dive after that period, DA:O was different and showed some clear steady growth in sales for months. Both seem to be generated due to user feedback and word of mouth...
As the marketing for DA:I was not aggressive and seems to be directed to heating up user interaction, it is reasonable to expect the same pattern as the previous games. Therefore Bioware' s response to initial feedback across all platforms would be decisive; especially for the pc which seems to be the most troubled platform atm...