I don't think the federal reserve has that many deep dark secrets. The main risk is going to be stuff like knowing that a bank is in trouble before it's public knowledge.
If previous releases are anything to go by, it’ll be a bunch of backups and databases from enterprise HR and IT software that was running on poorly secured Windows servers, though I don’t know how it adds up to 33TB. Probably undeduplicated backup images or something.
The dump from their Boeing hack was excruciatingly boring.
Trust in the Federal Reserve, and ignorance of its function, can be a strong partisan issue without waiting for a payload.