This latest article does seem to verify the possibility of the 4 cylinder A90. However, it also mentions that the car may be sold in limited markets like those that have taxes on larger engines (like Japan for example). NA with its wide open spaces and thirst for big engines and HP numbers may not be deemed a suitable market for such a car even if it is built.
http://club4ag.com/chief-engineer-te...ment-with-bmw/