Warlock
Succubus is unlocked at level 19 on pre-patch for Warlocks.
On a Warlock that scaled down to level 19, my succubus has ‘Seduction’ and ‘Lesser Invisibility’ unlocked. These skills are listed as being unlocked at level 17, 2 levels before the pet itself is unlocked.
On a Warlock created after pre-patch launched, at level 20- the succubus does not have ‘Seduction’ and ‘Lesser Invisibility’ in the pet’s spellbook.
This seems to expand to other Warlock Pets as well such as the Void Walker.
Hunter
I tamed ‘Margol the Rager’ at level 15 on a hunter that was created after pre-patch released. It is considered part of the Scalehide pet family with the family ability called ‘Scale Shield’. This ability is suppose to unlock at level 14 for the pet family, however, taming the pet at 15- it doesn’t not have this ability that it should in its spellbook.
Thoughts
Classes that can unlock/tame pets and companions are having issues with unlocking spells that they should have upon obtaining that creature. If the spell is unlocked at a level lower than when the pet is obtained, it may or may not actually come already unlocked. IE, Seduction (level 17) but Call Succubus (level 19). Scale Shield (level 14), Margol the Rager (req. level 15 due to zone)