On completing the first course I got an offer for 2,000 bonus miles if I buy a ticket on nwa.com and fly within the next 90 days. T&Cs are here:
http://www.nwa.com/features/wpufly/
On completing the second course I got an offer for 1,000 miles if I make two purchases through the WP Mall. T&Cs are here:
http://www.nwa.com/features/wpu2/