As it turns out, the reason the item wasn’t in the patch notes is that it wasn’t supposed to be in the patch at all, according to a comment on the Fortnite subreddit by Sean “MrPopoTFS” Hamilton, the community coordinator for Epic Games.
“The Storm Tracker was an idea that was being tested for one of those backpacks,” Hamilton said. “This was not intended to make it into the v4.2 Content Update and we can’t promise this will ever officially be released. However, we do hope those who get their hands on it had fun while it lasted.”
Backpacks themselves are a line of items that were added to the game in this same patch, with the first being the game’s brand-new jetpack. It’s still a little unclear what exactly the Storm Tracker does, but it appears to track where the next safe zone will be, so that players can get a little advance warning on where they might have to move next. Based on Hamilton’s comments, it sounds like the Storm Tracker has been taken back out of the game, but we haven’t been able to confirm that for sure.