In a recent interview with NowGamer, an EA Rep said the following.
The thing we can say about Glassbox is we built that as a foundation for future simulations for the studio and it’s highly scalable, it’s highly applicable to a wide variety of different platforms.
Some think this is referring to future games being released on Console, but it’s more likely mentioning how the different Maxis Studios could use the engines on other games. For instance, maybe The Sims 4 or a new franchise. What do you think?