D23 is one of the best (or worst) endeavors ever pulled off by the Walt Disney Company. On the plus side, it's usually full of one of a kind Disney related events filled with- the down side- mostly B grade celebrities. On the plus side, it can also be home to some of the most enjoyable presentations that are guaranteed fan pleasers. Models of coming attractions and those from the past, artwork, Imagineers speaking about beloved and lost projects and more.
Here on the D23 website is a large scale piece of concept art for Tokyo Disneyland and its re-imagined Tomorrowland, Sci-Fi City. The always wonderful Space Mountain appears in its hybrid Star Wars meets Discoveryland from Disneyland Paris form, the Rocket Rods zoom by, and the new crowd pleaser, The Flying Saucers, returns from the past to a settle in on a brand new continent.
My suggestion for finding great pieces: keep cruising by their website, and keep your eyes open on the official Disney Parks Blog too.
(Art copyright The Walt Disney Company.)