The NFL and NFLPA have agreed on changes to the trade deadline and injured reserve rules. The trade deadline will be pushed back two weeks to Week 8, more specifically the Tuesday after Week 8, according to ESPN's Adam Schefter. The new IR rules will allow one player to return to the team that season after being placed on IR.
The trade deadline rule is nice and could even be pushed back even further. The idea is to spur more trading at the deadline which doesn't happen now because it's so early in the season (Week 6). This should help some more trades get done.
The new IR rules will allow one player with a major injury to be placed on IR before the season and return later that season. Per Schefter:
Only players with a "major injury" who are placed on Reserve/Injured after 4:00 p.m., New York time, on Tuesday, September 4, or thereafter during the season, will be eligible to be reactivated at a later time.
Before anyone asks, no this likely wouldn't have affected the Chiefs if it were in place last season. ACL tears are a season long injury and none of the Chiefs' ACL crew would've been able to return that season.