I just downloaded 15w13a. I went to the the End to see what the new dungeon was like. The end crystals were fine. But there was no dragon. Or dungeon.
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After the dragon dies (you have to kill it by hand, you cannot use /kill), a portal like the one in the attached picture will spawn. You can only get into it by throwing an Ender pearl into it, which will take you to a series of infinitely generating islands far away from spawn (where you will find Ender trees and the dungeons).
I had the dragon but no dungeon. Maybe it's not quite 100% implemented yet?
Also, check your render distance. Mine was at 3 and I spent about 10 minutes looking for the ender dragon (in F1 mode because of pumpkins). I realized how dumb I was when I thought I was falling into the void but my render distance was just that low. xD