Completing all of the challenges for this week (week 3) unlocks another loading screen:

Blockbuster week 3 Challenge Location

Along with the above, the BlockBuster challenge loading screen for week 4 has been leaked:

Blockbuster week 4 loadig screen leaked

Here are the locations of hidden Battle Stars for week 3 and week 4 challenges thanks to Reddit user GamingSoldiers

Blockbuster week 3 and 4 Challenge Location

The bottom Battle Star is for Week 3, with the top left Battle Star for Week 4.

Credit to TwoEpicBuddies for leaking the loading screen for Week 4

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