One million? If this game manages to sell 350k - 400k units Capcom can consider fortunate.
After an encouraging opening in Japan (84,472 units sold) the game dropped like a rock showing no sign of legs. Its current sales are around 100k - 105k, pretty disappointing. Unless a miracle happens Okamiden will be sent to death in the west.
My projection:
Japan --- 125k (best price edition 70k)
US --- 150k
Europe --- 80k
Worldwide --- 425k