The new expanded guidelines for HARP programs will be implemented as early as December 1st. To qualify for Fannie's HARP program your loan must have been delivered to Fannie prior to 5/31/2009. Since you have already know the home is Fannie Mae invested I am assuming you have used the lookup tool. If not I will put the link below.
If you have any questions about HARP you can reach out to me directly. 248-430-1268
Fannie Mae Lookup tool http://www.fanniemae.com/loanlookup/
Freddie Mac Lookup tool https://ww3.freddiemac.com/corporate