I'm surprised no one has made a topic on this already (unless I'm really bad at searching).
There are two notable changes being made to Opal:
From 6 July, the travel cap will change. You will be able to travel all day on Saturdays, Sundays and public holidays and pay no more than:
$8.05 a day for Adult
$4.00 a day for Child/Youth
$4.00 a day for Concession
$2.50 a day for Gold Senior/Pensioner
and peak hours are have been largely widened (see the table here: https://transportnsw.info/tickets-opal/opal/fares-payments/h…).
No more $2.80 Sunday fundays :(