Ah, yes, Chapter 11 from Kid Icarus Uprising titled "Viridi, Goddess of Nature", starts you off in that setting for a bit as the humans fight each other for the Wish Seed that unknowingly to them is a hoax (thank Hades for that). Then you have that Reset Bomb that Viridi delivered coming in to create such an explosion (or as some also call it, a genocide). After the explosion, you see a big godly-sized hologram (or projection, w/e you wanna call it) of Viridi in the background for a few seconds. Then you work your way to get a closer look into what is now the Reset Bomb Forest that you'll eventually be going into (see land battle for the chapter). Once inside, you look around to find out that it's to be one huge maze filled with pinkish vines, damaging spikes and more. With that, this stage may be a Castle Siege replica in its stage-changing aspect.
Truth be told, Sakurai really does have a liking for Viridi, and I knew that since KI:U (I remember him saying something about offering more hearts to Viridi than Palutena and such), but I didn't see this stage coming. Just shows how amazing Sakurai can be when it comes to surprises.
And that's pretty much the synopsis of today's amazing picture. <3
*now imagines Viridi's chances to be playable increased* It's possible, right?