Look below here. No mention of A Sims 5 but I expect it would come this way. EA are looking for testers for 4 games to start with. It could mean that a Sims 5 game could become enormous but still playable on lower spec. machines.
"The bottom line is this. Cloud gaming is coming. It’s no longer a question of if, but when. It’s still really early days but we’re excited to take this next step in our learning, and it’s great to be able to do it with some of you in our community. This is about enhancing the quality of our games and services for a cloud powered future. So if there is an opportunity to elevate the experience and inspire more people to play, we are going to explore it."