I tried so hard to avoid every spoiler, but the artists wouldn't stop drawing her. Alas, I eventually discovered Twilight is going to become... an acorn! I'm sorry for spoiling it for those still unaware.
Now we know how Bloomberg came to be. He used to be the pride of the Apple family: a student of Princess Celestia herself! And then, when Bloomberg became a hero of Equestria several times over and found his friends, Celestia helped him ascend to acornhood. Eventually, Bloomberg achieved his full transformation into a tall and mighty tree, and is now Equestria's highest ranking official in the Appleloosan orchard.
I have to compliment the picture's technical sides. I like the shading here, on the tiny wings and the "hair" and the tiara and the acorn's shell itself. Linework's nice in the way of varying thickness of lines. And this face is as fiting as could be. Well done!