We had a situation today in which a player was "invisible": he was eligible to be signed, but not appearing in the FA pool. As such, the following will pertain to all future FA signings and be in the rules:
Any free agent player is not eligible to be signed by any team until they appear in the FA pool.
Another addition to the rules (carry over from last year):
Free agents are not eligible to be signed between the end of the World Series and the beginning of free agency.