It looks like Season 6 of Fortnite Battle Royale will see the return of the weekly bonus challenges like the Blockbuster challenges in Season 4 or the Road Trip challenges in Season 5.
For Season 6 the bonus challenge each week will be called the 'Hunting Party Challenge' and it looks like they will work much the same was as in previous seasons.
When you complete all seven weekly challenges you will unlock a bonus loading screen and, if you look closely, you can see a clue in the Week 1 screen.
A silhouette of a battle pass can be seen above a tractor in the middle of the loading screen, which means that this week's hidden item is a Battle Star that will grant you a free Battle Pass Tier when you collect it:
If you're not sure where the image is hinting towards, the exact location is the small farm to the east of Paradise Palms.
The exact location is marked on the map below. Once you've completed all of the Week 1 challenges, go to this location and find the red tractor on the hill. The Battle Star will appear when you are close by.
As always, we advise that you complete your game after collecting the bonus battle star. Returning to the lobby without being eliminated or getting the victory royale could result in your challenge progress not being applied correctly.
If you're still struggling, randomChievos on YouTube has uploaded a quick tutorial video to show you the exact location: