Honestly, I just thought it was funny that something they mentioned changing in... 2.1? finally got changed. That and pets aggro radius is now 6 meters smaller.
In other news, theres actually some pretty big hunter pet changes in BfA that, if you play hunter (booooo) you should check out.
In short, pet types will have a set specialization tree (no more ferocity turtles or tenacity cats, sorry boys) and those specializations will come with standardized abilities. Every ferocity pet gets bloodlust and 10% lifesteal for pet+you, for example. Cunning pets get a mini trinket and move speed boost for you+pet (8%! Holy shit!). Tenacity gets some dmg reduction and health boost.
And individual pet types have special abilities that have been standardized. They are hamstring, mortal wounds, an automatic shield wall, and purge (which is currently not available until lvl 35)
Things like heart of the phoenix/last stand/roar of sacrifice have been removed, however certain exotic pets will have similar abilities.
More detailed info
here.