From publisher blurb:
The sequel to Monstrous Races, Monstrous Races 2 presents player options to play every monster in Volo's Guide to Monsters. Volo's Guide to Monsters includes both new monsters and variations on existing monsters, so Monstrous Races 2 includes new monstrous races and a variety of new options for monstrous races published in the original Monstrous Races.
What is in this document?
49 playable races (every creature in Volo's Guide to Monsters, no exceptions!)
29 subraces
5 templates for player characters
Rules for Tiny player characters and races (They're the same as the ones in the original Monstrous Races), plus new rules for Large, Huge, and Gargantuan players!
1 new general feat
22 new racial feats for races in Monstrous Races and in Monstrous Races 2
3 new backgrounds
5 new magic items
4 new spells
3 appendices with suggestions for campaign, character, and party ideas to make use of monstrous races
You do not need the original Monstrous Races to use most of this document, but owning Monstrous Races will make the design notes make a lot more sense.