According to Community Manager Crithto on Twitter
,"Nothing changes with how you can earn the pet in 6.1 so keep on cookin'!"
So it's doubtful that there will be a higher drop rate from the new 125 stat food.
Between two PTR characters, I cooked 1327 of the new food and had 0 pets drop. That could be due to RNG or the drop rate is just as low/random as it currently is for the existing cooking recipes.