Dec 12 (Reuters) - Americans shopping for toy remote-controlled airplanes or helicopters may find, sometime in the near future, that they come with unexpected accessories: A raft of new regulations. The Federal Aviation Administration, by the end of the month, is expected to propose new rules governing small unmanned aircraft systems, the first major overhaul of its drone policy. The agency is closely guarding details, saying only that the rules will cover a wide range of users flying aircraft or drones weighing 55 pounds or less. But legal and policy experts who have advised the FAA and lobbied on drone regulations said they predict the new regulations will include restrictions on hundreds of thousands of people who fly quad-copters or toy planes in parks or backyards. Experts said that based on existing drone guidelines, the new FAA rules, expected to take at least a year to kick in, will likely require, among other things, recreational fliers to either join a community-based model aircraft organization - or obtain authorization from the FAA. The rules also could place other restrictions on people who fly drones recklessly, the experts said. If the rules omit discussion of recreational fliers, the experts added, that could sow confusion on what type of flying is allowed. "There's basically going to be two options," said Richard Hanson, director of government affairs at the Academy of Model Aeronautics, who has lobbied Congress and advised the FAA on drone regulations. "You either participate in a community-based organization or you have to follow the rules as if you are commercial operator." Read more: INSIGHT-Drone downer: Will new FAA rules ground recreational fliers?