From publisher blurb:
The seas hold many wonders, one of them is YOU!
The merfolk ancestry Comes is our most filled out ancestry yet! With a variety of heritages, feats, weapons, alchemical items, and magical items to choose from!
Worried about travelling on land? No fear, there are feats and heritage options to make this more feasible, as well as equipment, all available from first level!
6 unique heritages
13 level 1 ancestry feats (1 new with 1.5 update)
7 level 5 ancestry feats (2 new with 1.5)
4 level 9 ancestry feats (1 new with 1.5)
4 level 13 ancestry feats (2 new with 1.5)
3 level 17 ancestry feats (all new with 1.5)
3 new alchemical items
1 new material type, including its uses for armor, shields, and weapons (new with 1.5)
3 new weapons.
2 new kinds of ammunition
4 new weapon traits (5 if you include the merfolk trait)
4 new magic items including a new weapon property rune! (1 new with 1.5)