Yesterday, the International Hockey Federation (FIH) circulated very minor updates to the 2019 Rules of Hockey and Indoor Hockey, effective Nov. 1 2020. Any significant rule changes are still scheduled to be issued after the Tokyo Olympic Games and the Indoor World Cup respectively.
4.2(c): knee pads that match the sock colour OR are black are permitted
Field Specifications 1.7(c): nets must hang outside or be attached to the boards
4.2: knee pads that match the sock colour OR are black are permitted
5.1: if time expires just before an umpire would otherwise have made a decision, that decision can be made after the end of that period (same as 5.1 outdoor rules)
13.3(a): the guideline for the amount of time players can take to put on their protective equipment is increased from 20s to 30s
Go to the FIH rules page to download the updated .pdf versions. The Rules app has yet to be updated.