...and while Jeb adds yet more contents for caves, the ocean biomes still remains empty and boring...
Why don't you downgrade back to Alpha?
Seriously, though, this is the "Pretty Scary" update. I would expect ocean content to be a major focus of a future update, 1.5 or 1.6 perhaps. It feels like the best updates are those that are specifically focused on a theme.
Ocean Update, including such magical features as sponges, corals, fish, sharks, and less-derped squids.
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Because pokemon totally invented bats using echo location amirite?
No, because attacking with their echo location is something that Zubat is known for. It annoyed/annoys anybody who plays the first 4 generations of the game. Hell, omnipresent cave bats that attack with sound is kind of a hallmark of the main Pokemon games.
Personally, when I first read that the new neutral mob was bats, I was like 'meh'. Then I hopped on my snapshot survival world (with backups, naturally) and when spelunking, I fell in love with the bats. Walking through ravine/mineshaft with bats flying about was very nice. They add quite a bit of atmosphere to caves, and they really fit into the world of Minecraft.