Actors are paid to act; any agent can tell you that the script is the least important part to them. When it comes to the principal cast (which the sales and financing are predicated), unless I can call the agent or manager directly myself and verify, there is no real attachment. The exception being a Spielberg or a Scorcese whose stature in the industry could reasonably facilitate any star interest.
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.