If you purchase The Sims 4 Cottage Living Expansion Pack by September 2nd, 2021, you will receive exclusive bonus content with the game. Over on the pre-order page on Origin you will find the following details and phot of the bonus content.
Limited-time bonus content
Purchase Cottage Living by Sep 2 to get Gnome on the Go bonus items. Ride around on a bike, make a statement with a decorative gnome and add some sparkle with Bramblewood’s lit tree.