Good idea, actually. I think I'll try finding some flint.
I think clay has become more common, it might be generated in new places, but I'm not sure.
I finally found an Enderman. I lost it, but found it again. SPOILER. They sound like zombies when you hit them, and when you hit them, it seems like they tp to some place nearby which you can't see. After 3 hits with an iron sword, they die, and drop nothing. Maybe xp orbs, but I'm not sure if it did.
Edit: Yes, there's certainly some changes in clay generation!