According to the Worldperks agent that I spoke to today, she said that the awards chart has not been loaded into the system yet. I too did a search on the NW site and found nothing, just the mention of the Skyteam members to earn and redeem award.

You can always use DL awards chart as a point of reference, although there is no guarantee that this will apply to NW.

See: http://www.delta.com/skymiles/use/sk...t_us/index.jsp and
http://www.delta.com/skymiles/use/skyteam/rtw/index.jsp for RTW.