People need to understand that the addition of beds will not ruin the game, as creatures still spawn in darkly lit areas (sometimes even in your home if you do not light it properly) and down in caves, regardless of the time of day.
Also, there's already a Peaceful mode that removes mobs, so how's this any more game-breaking than switching from Easy to Peaceful or whatever people play? I personally enjoy the idea of beds, as I'm tired of trying to fix something outside at night during Normal or Hard sessions only to find a creeper hiding behind my door and blowing up my diamond gear. It won't remove the mobs, only reduce the nights you don't want to fight them.
Besides, you still need to kill mobs for their rewards, such as the creepers for their supplies in TNT, Skeletons for their Bone Marrow to instantly grow trees and food sources, zombies for their feathers, etc. It just depends if you want tonight to go out and harvest supplies from mobs or simply sleep the night away and built once you get back up.
As for the bed design, I'm sure that picture in the article is just another user-created bed, as it's just wool, half-stones, and signs positioned that away. Notch prefers to design the items uniquely, so it'll possibly actually look like a bed, not a fashioned one that people make just for the sake of decoration.
In the end: It's all cool, brosssssSSSSSSSS *explode*.