In a sense it didn't change much. It's not like the government can access your transaction data all the time. They still need to go to court and request a warrant for that, to break your bank secrecy.

It's not different from what we had before.

EDIT: it didn't actually change a thing. Banks are still required to maintain transaction data private, and agencies, including the government, MUST obtain a warrant to break transaction data secrecy.