According to Bloomberg, the FHFA has extended the HARP refinance program to the end of 2015. This means that homeowners whose mortgages are backed by Fannie Mae and Freddie Mac will have an additional two years to obtain a new loan for their homes.
In order to qualify for HARP, a homeowner must be current on payments and the loan must have been originated before June 1, 2009. Although a refinance won't return an underwater home to positive equity, it can lower payments to more manageable levels.