Update: April fools :)
The long-nosed villagers introduced in Minecraft beta 1.9 have become sentient. They have taken over our skin servers and content delivery networks (CDN), so unfortunately you will not be able to change your skins until we fix the problem. We are desperately trying our best to pull the plugs, but we should prepare ourselves to serve under our new villager overlords. Singularity may be upon us.
// The Minecraft Team