It the Collector's Companion Tome (game guide), it mentions jaguar speed in one part of the guide, but in game and later in the guide that skill isn't there and instead it shows jaguar's intimidation. Are there hidden skills when selecting a new game + path, or is this just an uncorrected mistake in the guide?

 

Since Guides and booklets are written during the game making process/before public release, more likely it is just the guide.

A guide will write something and Developers may change it last minute before game releases.  Most time why strategy guides will often have stuff not mentioned/missing half the time.

I tend to agree. I haven't seen anything about Jaguar's Speed yet. Jaguar's Intimidation is definitely a New Game+ Skill. There are 3 new ones in each category.

Eagle Path (Seeker)
 · Eagle Sight - Increase zoom factor for all weapons.
 · Eagle Perception - Increase range of Survival Instincts and Perception.
 · Owl's Feast - Harvest more resources from spiders and beetles.

Jaguar Path (Hunter)
 · Jaguar's Intimidation - Enemy accuracy is decreased for a short time after witnessing a takedown.
 · Jaguar Strength - Enemies take longer to recover when knocked back or knocked down.
 · Jaguar Rage - Damage resistance for a short time after any kill.

Serpent Path (Scavenger)
 · Serpent Evasion - Enemies are less accurate at determining your location after return to concealment.
 · Viper's Cunning - Lure traps are upgraded to an incendiary bomb and attract multiple enemies.    
 · Serpent's Rage - Perform a chained takedown when two nearby enemies are stunned.    

There are also new outfits and weapons that come with each category.

I haven't done NG+ yet myself, so I'm not sure exactly how some of these work or if it's possible to unlock more skills later, but so far I haven't seen anyone mentioning Jaguar's Speed.

All the skills and outfits in NG+ can be bought with XP/at the seller locations.  I think the name is as Tyler mentioned, it's in a stage of development then for whatever reason gets called something else or changed or both.