Today EA Dice revealed the faces that you'll be able to use to customize your Star Wars: Battlefront soldier. They were hidden in the new companion website, which had all the pictures, including those that you'll need to unlock.

Rebel soldiers will have 18 faces unlocked from the start, all human, and all wearing helmets. Both genders are represented. All the other faces that you can see in the gallery below have to be unlocked with increasing rank requirements (from 1 to 30) and spending in-game credits. Almost all the human faces cost 1,700 credits, besides the last one (the one with the reddish Leia hair named Ingrid_06_Red), that for some unfathomable reason costs 2,200 credits.

Alien heads require rank from 40 to 50, and cost 17,000 credits each to unlock.

Interestingly, as an Imperial, you'll have to earn the right to show your face.  You have only two available heads at the beginning, one female and one male, but they look exactly the same, wearing the StormTrooper helmet. There's no difference whatsoever in the armor between males and females, apparently.

All human heads are unlocked between rank 1 and 30 for 1,700 credits each, besides once more Ingrid_06_Red, that costs 2,200. Scout Trooper and Shadow Trooper are unlocked respectively at level 40 and 50, and cost 17,000 credits each.

Before I leave you to the galleries, if you want to start stockpiling credits in order to unlock the faces as soon as possible (even if you'll still need to rank up in the game), you can do so with the newly released Base Command minigame.

Rebels:

Imperials: