EA is rolling out CAS Demo invites to lucky players all around the world! If you have the Origin Download Client, log into your account and check your Games Library. From what players are reporting, the game is appearing in their Origin client upon logging in, and others have reported receiving emails with redemption codes.
@IamBerry The Sims 4 CAS Demo is available now by invitation only for some of our fans. It will be available worldwide later this summer.
— The Sims (@TheSims) July 8, 2014