The Rogue Agent starter pack is available on the App Store for a limited time

The App Store announced last night that the Rogue Agent starter pack would be exclusively available to purchase on iOS devices for a limited time over Christmas:
A @FortniteGame holiday surprise! ??
— App Store (@AppStore) December 22, 2018
The Rogue Agent Pack has returned, exclusively on the App Store.
It's here for a limited time. Alert your squad mates and don't miss out: https://t.co/w0Xe3LstgU pic.twitter.com/sDJxUOT0pO
The Rogue Agent starter pack originally released to Fortnite Battle Royale on March 27, 2018 and contains the following items:
- Rogue Agent outfit (Epic)
- Catalyst back bling (Epic)
- 600 V-Bucks

The outfit also appeared in the Item Shop on September 25, 2018 for 1,500 V-Bucks, which was a shock to many as it was expected to be a limited time item:

No specific details have been given on how long it'll be available so if you want it, you better pick it up soon.