GM has approved rules changes proposals, they are marked in red style in the different discipline rulebooks.
See https://hdhiaa.net/about-iaa scroll down to rules.
The most Important ones as general for 3D and Historical
Age groups are decided on age filled 1-st day of competition
Veterans are 55 years old, or older first day of competition
Veterans that are older than 65 years get a medallion for participation
the five highest ranked shooters are shooting the finals
maximum 7 arrows shot/target, elimination in case of miss with all arrows
Crossbow style changed to Crossbow Limited (CRBL)
Maximum allowed energy of arrow is 165 Joule
No minimum poundage on bows, any strength is allowed
***Please see changes in rules as only a few of all changes are mentioned here