The forgiveness applies to anyone who enrolls in the new plan, not just existing loans.
New plan is 10 yrs for <= $12k in loans, increasing a year for every $1k additional, so for example, someone who takes out $20k in loans can have the remainder forgiven after 18yrs of payments.
The 20/25 yrs was the old forgiveness plan with lower principal loan and income levels.
Additionally, if you're making your monthly payments, no interest accrued.
It’s a new payment plan, so applies to new student debt as well.
If I’m reading the StudentAid.gov correctly, the SAVE plan has the following: