Some reporting companies consistently file press releases with the SEC; others don't. There doesn't seem to be any hard rule about it.
Issuing a press release makes the company compliant with Reg FD. So does filing an 8-K. What's important is that the information contained in either be accurate.
If it isn't, that would open the company up to fraud charges.
Normally, companies do make the names of their accountants and auditors public. If they're SEC filers, they almost always report changes in an 8-K.
