There is not much out there but this may help for a start:
http://www.faa.gov/ATS/ato/rnp.htm
What city pair you planning? Don't let the Tokyo and Japan specifics put you off. I deal with airlins that fly tracks 2 and 3 between RCTP/ZSPD to KLAX every day. It would be nice for a MNPS equivalent though.
Hope this helps.