New I/O qualifications - 24 months reserves!!!

Wow...anyone else catch this???  I understand the logic behind it, but 24 months???  Wow...

In the DU Version 8.1 Release Notes, Fannie Mae announced changes to the eligibility
requirements for interest-only mortgage loans.  With these changes, Fannie Mae has structured
the interest-only option for borrowers who are in a position to choose it as a financial
management tool, rather than as an affordability tool.  Borrower qualification is based on the
borrower’s ability to sustain payments subsequent to the initial interest-only period.   
 
This Selling Guide update incorporates the following interest-only eligibility changes:
 
 These transactions are no longer eligible for delivery to Fannie Mae with an interest-only
feature
- cash-out refinances, 
- Flexible mortgages, 
- MyCommunityMortgage® loans, 
- investment properties, and
- two- to four-unit properties. 
 The minimum representative credit score is 720.
 The borrower must have minimum reserves of 24 months.

I saw that and wondered if it was a typo....