I completely understand the smoke_and_mirrors dance producers have to perform to bring all sides to the middle, but when it comes to key talent attachments, if it's not verifiable, it doesn't exist. Bottom line, ditch the letters and let us pick up the phone and verify Mr. Jackman.
Bankruptcy Letter of Intent. Just like anything else in life, if you are planning a drastic change you should probably inform those who will be affected. The importance of keeping people informed is a requirement in some circumstances. A "letter of intent" is used in these situations. This letter informs companies or the public that future legal proceedings will occur.