Update: The release of 50v50 has been delayed:

Epic have released a post over on the Fortnite subreddit stating the 50v50 LTM is returning today with some changes to item and resource spawn rates. Along with this, Final Fight (8 teams of 12) is being removed.

“We’ve heard your feedback regarding the Final Fight LTM and we agree that the mode isn’t quite in a state where we want it to be. Due to this, we’ll be disabling Final Fight and re-enabling the 50v50 LTM at 10AM EDT.

This time around 50v50 will have:

  • Double normal Dual Pistol spawn rate
  • Double bounce pads spawns
  • +50% resource rates
  • 50v50 v2 storms

Thank you for all of your feedback on the Final Fight LTM.”

SOURCE: Reddit