Dice's feedback from closed alpha and they announce open beta is in early September.
https://www.battlefield.com/news/articl ... we-learned
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There'll be an open beta late summer I think, gamescom is the end of August so it'll probably be after that. Pre-ordering will get you in to the beta early but you don't have to have bought the game to have access to the beta.
The default cross hair colour is white so you may want to change it as the only map available is a snow map. The squad system is bugged so you can't join/leave squads and you need to use the quick play options as you can't queue from the browser.
FYI on your origin account page there's a tab for game tester program, make sure Battlefield is ticked if you want to make sure your name is in the hat for a chance at the alpha.