Do not get your hopes up. Heller already ruled on machine guns. This is the Dangerous AND Unusual part of the ruling.
Unusual was decided in a later case as less than 200,000. It would be hard to see a change in this as it was stated in three Supreme Court cases. Always hopeful but not likely. Appeals will overturn and Supreme will not take it.
Lets take on the other parts of NFA, short barreled rifles and silencers. Silencers are not dangerous and short barreled rifles are not unusual.
The rule changes maybe an action by the ATF to clog the courts and delay any rulings on silencers. There are some cases working their way though the courts that will touch on short barreled rifles.