It’s more guns and fixes.
Epic released a dev update video that talks about changes to be made to the Battle Royale mode for Fortnite. Take a look:
The two things talked about at length are the introduction of more guns and consumables. Both have to be carefully thought out not to break the balance of the game.
“One of the prototypes we’re working with right now is a potion that allows you to heal above 75 health and will give you some shield as well. We’re toying with making that a benefit over time so there’s a risk associated with using it.”
The devs also mention going from hitscan for bullets, where the shot is immediately registered after pulling the trigger, to projectiles which makes things more physical.
Assault rifles, SMGs, character customization, and progression are all in the works so we can expect lots of new stuff to come.