It's closing April 16th and will open again in the fall, late September/Early October. I've heard that it will be a whole new experience, which will be a good or bad thing because everyone loves how it is now.
Here's the information I've gathered about it:
As part of the re-imagining, the Future World attraction will feature a sleek new Chevrolet Design Center at Epcot immersing Guests in the fascinating world of automotive design. Amid upbeat music, engaging media, dramatic lighting and a collection of Chevrolet concept cars and model vehicles, guests themselves will become automotive designers and peer into the future of personal transportation in the process.
At interactive design and styling workstations, Guests will be able to create their own custom concept vehicles. The adventure will then shift into high gear as Guests buckle into their 6-person SimCar ride vehicle and put their design through its paces on the exhilarating hills, switchbacks and straight-aways of the Test Track circuit. It will still be a real ride on the course, not a simulator.