Free things are great, so here's a free thing (if you're subscribed to Twitch Prime, anyway): there's two free outfits, called Sub Commander and Havoc, going out to those who have paired their Twitch and Epic accounts now. Exactly how long the promotion will last for is currently unclear, as the service is, conveniently, down, but it will probably be for a couple of weeks.
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The outfits work in both the original Fortnite mode (aka Save The World) and Fortnite Battle Royale, but, of course, it's probably the latter you probably care about more. You can see the characters above, with Havoc being the dude on the right, and Sub Commander being the dude on the left.
Havoc comes with his own Back Bling, and Sub Commander comes with the glider that you can see above - the four little pictures in the bottom left of that picture are four new Twitch emotes for you to use at your pleasure. It's no PogChamp, but, y'know, it's nice to have them.
There's currently some technical issues at the time of writing, with Epic's website being down - it might be best to wait a few hours and come back to Twitch after to see if you're able to unlock the free gifts then. Once it is up, though, all the details will presumably be available on Epic's site for the Twitch Prime pack.