The beta is going to contain three maps, namely Galactic Assault on Theed for forty players, Space Battles on Fondor for 24 players, and Strike on Takodana. The same user has previously leaked several details on the game in the preceding weeks, including details from the game’s alpha version, and most of these have turned out to be true, so while this is in no way an official announcement from EA themselves, it does seem to be pretty reliable information.
The beta for the upcoming Star Wars: Battlefront II is less than a month away now, but if that time is too much for you to bear, we have information on it thanks to a leak on by Reddit user Some_Info.