I think that is a great idea and that they should be quite rare. But I really don't think it would be added because of all the other requests(at least because of this post).
Yes, check your roof for spiders. That is the most common problem. It could be an enderman that you accidently looked at that is teleporting before you get a glimpse of it all though that is not very common. And if these posts don't cover it (everyone's posts), then I have no idea.
If this could be added to the game, it would add a lot of excitement, as well as just give something to brag about, like, "Hey I've killed 12 Giants!", or something like that.
I have been looking around in the forums, but this one caught my attention. I think this would be a brilliant idea, and I think that it could have the same stats as the Iron Golem, and only get spawned if a zombie got hit by lightning. So basically an Iron Golem with the taste for blood.
And I also like the new texture idea.
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2. Herobrine has been removed.
3. You can use torches, glowstone, and ignited furnaces to light your mine up
4. Can't help you.
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And I also like the new texture idea.