The prize is a Plumbob Monument, which also happens to be the prize given out for completing that Bedrock Wonder. This tiny little statue offers a bonus of 50 population to an area two squares ...

Many items are decorated with the game's iconic green Plumbob. The merch store has only been up for one day, but some of the items are already sold out, including the Freezer Bunny plush toy.

If you buy the game on Origin before May 1, 2018, you'll get access to the pack, which gives you the Llama Man and PlumBob skins for your in-game characters. These are apparently genuine Sims 4 ...