This is a set of rules the US is thinking they can use to regulate Bitcoin.
The most important one being the very last one
12As our response is not in the form of an administrative ruling, the substance of this letter should not be considered determinative in any state or federal investigation, litigation, grand jury proceeding, or proceeding before any other governmental body.
It basically state, nothing in this document has any legal status.
However, if enough people start following the rules in the document, then they will create some rules to match what they suggested in the first place!
My advice is to read it, find the holes, and make sure you do things that way so you don't get caught out when these rules finally come in in a few years. Oh, and keep quiet about what you are doing, and why!
