Start creating and saving loadouts for your Battlefield 1 soldier now.
Battlefield 1 doesn't officially release until Friday, but it's available now if you're willing to pay extra for the Early Enlister Edition, and to those with EA/Origin Access subscriptions.
Now that we're at launch, the official Battlefield website has been updated with all sorts new Battlefield 1-specific features. This is also why the new companion app went live today.
You'll need to log-in first before you can do anything. Once you've done that, you'll be able to view your career stats, which can be expanded into a very detailed lists of all the in-game statistics EA tracks.
From there, you'll be able to customise your dog tags, see the available medals, and read the Codex cards you've been unlocking in-game. There's also a page that allows you to customise and save multiple loadouts for all classes and vehicles.
You can see your earned Warbonds, and even unlock any of the ones you do not currently own.
It doesn't appear to reflect the changes I made in-game, though, for some reason. But maybe that's just launch. Try it for yourself at the link above.