An understanding of the various game modes. It wasn't until this weekend we got confirmation that 9 modes are expected.

We already know how most of the modes are going to work, and they need to save some marketing ammunition until the game is released.

Will there be server browsers? Can players host their own servers and regulate the specifics of a match?

Wasn't this already answered as a yes?

How does player customization work?

Already answered

What can we purchase with currency? How do star cards get earned/unlocked?

This would be good to know

Are there plans for a premium subscription?

This would also be nice to know

What is the replacement for Battlelog that they've eluded to?

They said they'd be using an in-game solution this time around

Can we see some of the new maps?

Agreed, although considering they're probably still being worked on and DICE/EA want to make the best possible first impression, I feel like this is unlikely until the last couple of months before the game's out

Can we see some new gameplay?

Same as the previous answer

What are the system requirements?

Expecting those before the game's going through its final optimisation passes is insane. Any requirements they give would be wrong.

For the majority of the part, I just don't understand why so many people need to know everything about a game before it's out. What happened to the sense of wonder, what happened to patience, what happened to wanting to be surprised by games? You know more or less how the game is going to play out, you can infer that it's going to have DLC and we know that it runs more or less as well as, or better, than Battlefield 4 thanks to leaked information from the alpha. Wait until the game's out, check reviews to see if it's good, and then buy it if you want. Let yourself be surprised.