Downloaded it yesterday night, couldn't find any Endermen, NPC Villages (though NPC's aren't in it yet, apparently). But I found an underground ravine and an abandoned mineshaft though
The NPC villages are pretty bad imo. The abandoned mine shafts on the other hand are amazing. I found this one which spanned this whole huge ravine, crossing over it at different points. Looked amazing.
Found a couple of bugs too, such as fast-forwarding time in Survival mode and Endermen not teleporting if they're standing in cobwebs.