We already knew the Guided Missile would be making a return and Epic have now updated the in-game news feed to feature this item:
Return of the Guided Missile! Rebalanced for scouting utility.
This is likely to be returning into Fortnite in the V5.1 Content Update tomorrow.
We know that a lot of changes have been made to balance this weapon, as it was over-powered when it was initially launched. It will have more of a scouting feature than being an explosive weapon.
We will have to wait till tomorrow to see how the Guided Missile has been changed and how it will affect gameplay.