ArenaNet has revealed 3 out of 4 playable species that Guild Wars 3 will have at launch: Humans, Asura and Kodan. A fourth race is still kept as a secret, but it will be one that is home to Orr and has not been playable in other games of the franchise before.
The team also explained what goes into designing playable species. Read the full post here: https://www.guildwars3.com/en/news/our-approach-to-playable-species-in-guild-wars-3
We have also updated our complete guide to everything we know about Guild Wars 3 with all the new info.