On a 2m base of new users and considering COD generally got 1m (1% of base) on an install base of over 90m.... I think they'd be excited by 100,000 (5% of base), but realistically 50,000 should of been all that could be expected. Even if they did get the 5m out by March.
Considering the Miiverse has 20 to 30k in it all the time, I think they sold between 50k and 100k. Since the game has had no sale prices they should have revenue of around (75k*$35) $2.65million. I doubt they spent half that on the port.
This report is bogus. Activision probably spent less than $1m porting the game and I'm sure they've made that back and then some. While the overall sales of WiiU have died off and thus game sales are likely lower than they all want, its certainly not losing money for them.