On August 26th, 2018 the following changes will go into effect for the Chase Sapphire Reserve:
Transactions that qualify for the $300 annual travel credit will no longer earn points. Since they currently earn 3 points per dollar, you're looking at 900 less points a year.
Priority Pass select access will be limited to two guests per visit. Additional guests can be admitted for an additional fee of $27 each. Although this seems like a negative, a lot of the lounges have been overcrowding lately and this new rule could help with that.
Overall, these modifications have little effect unless you plan on taking a large group inside a lounge or are an avid user of Chase's price protection service.
H/T: Doctor of Credit