In short they say:
"Although the exact language of the proposed regulation is not yet known, there are a number of conclusions that can be drawn from the ARC recommendations. The following are AMA’s areas of concern, the restrictions that are likely to be imposed and their effect on
the model aviation community:"
ALTITUDE: As proposed, the rule would impose a nationwide altitude ceiling of 400 feet.
SPEED: It is likely that the rule will attempt to limit model aircraft performance by
establishing a set speed limit such as 100 mph
WEIGHT: As proposed, the sUAS rule will limit small unmanned aircraft to 55 pounds
TURBINE BAN: The blanket prohibition of gas turbine engines.
AIRPORT PROXIMITY: It is understood that the FAA is considering going outside the ARC’s
recommendation and extending the “area of concern” around the nation’s 19,760 airports
beyond the current 3-mile radius to 5 miles.