I believe that all forms/documents filed with the SEC are required to be made available to the public. That doesn't mean the company is required to release a PR to announce a submission, but they should be free to do so if they wish. It can't be considered inside information once acknowledged and approved by the SEC, since the SEC is required by law to make a form or document submitted by a publicly traded company accessible for public viewing.
Press releases made or approved by the company can't be considered inside information either because the public has been given access to the information. As long as the information hasn't been restricted, or in other words hidden from the public but divulged to select non-insiders, then there is no violation.