[Koro76]

While the product listing for the GMG seems to include the following:

- Custom Monsters and the option to customize existing monsters
- A wide variety of optional rules allowing GMs to customize many aspects of the game, such as permitting dual-classed characters, adding a Stamina system to PF2, or changing the list of ability scores used for characters
- Approximately 2 dozen artifacts, cursed items, and intelligent items, including iconic pieces like the bag of devouring, deck of many things, and sphere of annihilation
- 83 Generic NPCs, such as a beggar, cultist, or innkeeper, ready to be dropped into your adventures
- Custom Hazards (on the way)
- Custom NPCs (on the way)

It doesn't seem to include a bunch of other content from the book that would be extremely useful in HLO, such as:

- Item Building (Tools)
- Custom Intelligent Items (Tools)
- Custom Cursed Items (Tools)
- Relics (Tools)
- Custom Artifacts (Tools)
- Specific gems and art objects (Tools)
- New Afflictions (Tools)
- Stat blocks for (or the ability to create stat blocks for): Nations, Settlements, and Planes (Tools)
- A way to track Victory Points (Subsystems)
- A way to track Influence (or a way to create influence stat blocks) (Subsystems)
- A way to create Library stat blocks (Subsystems)
- Chase obstacles, or a way to build/run a chase (Subsystems)
- Infiltration obstacles, or a way to build them (Subsystems)
- A way to track reputation (Subsystems)
- A way to track Organization stats for the Leadership subsystem (Subsystems)
- Vehicle stats, or ownership (Subsystems)
- Deep Backgrounds (a similar system was in HLC for PF1) (Variant Rules)
- Level 0 Characters (Variant Rules)
- Automatic bonus progression (Variant Rules)
- High-Quality Weapons/Armor (Variant Rules)
- Proficiency without level (Variant Rules)

I realize that not all of these items are supported by the current features of HLO, and I wouldn't expect them all to be added immediately. Furthermore, some of these items may fall outside of the scope of HLO itself. May of them, though, are possible and desired as features. (I also didn't have time to go through each item and check if it was implememted, but the ones I did check, weren't.)

Is there a plan to implement more of the GMG as time goes on, or are the only forthcoming features/content the custom hazards and NPCs?