If you check out the other [ying to our yang, darkside, insert expletive here] popular fps and when their beta dates are you can only speculate that it's very early September.
Surely they won't have the beta clash with the aforementioned game and as far as I know, those details have only been recently released.
Not sure how DICE's marketing team work but I for one am not preordering until I know the date.
Are there issues with the beta? A recent tweet from a dev suggests not.
Imo, they need to have it sooner rather than later as the hype train is slowly chugging to a stop.
Tldr - Soon™