IGN has an all-around meh guide
here, but it's more geared to new players. There's no succinct guide for all the changes (Nooooo Serebii why?!), but I can give a general run down.
1. Male and Genderless Pokemon now pass their ball when breeding (with Ditto). Yay!
2. Female Pokemon will have an 80% Chance (unless it only has 1 available ability) of passing their ability, regardless of she is HA or not. Males (I think) have a 60% chance.
3. When breeding Pokemon of the same species (not just the same evo line, the actual same species), the offspring's ball is a 50/50 roll between both parents.
4. The
Daycare Nursery will no longer give your Pokemon exp whilst there, and removing Pokemon will always cost 500$ Ingame.
I think those are the most obv changes to Breeding, but if anyone remembers others, add them please.