The United States Postal Service is poised to make announcement Wednesday morning regarding Saturday services.  The cash-strapped organization is expected to cut first-class mail delivery beginning in August.  The changes are said to be part of the postal service’s effort to cut costs.  The move is expected to save $2 billion annually.  Package delivery, however, will remain unchanged.  Postmaster General Patrick Donahoe will speak at press conference scheduled for 9:00 a.m.