Friday, June 5, 2020, President Trump signed the Paycheck Protection Program Flexibility Act, which the U. S. Senate passed with a unanimous vote.
There are two major changes. First, the period in which funds can be used has tripled from 8 weeks to 24 weeks. Second, the required amount of funds used for payroll has decreased from 75% to 60%.
There are a number of sites covering the details, but CapinCrouse has published an excellent “unpacking” which you can access with the link below.