Bats, Hornets, and Eyeballs no longer enter water? does that mean they float?

Answer 1

"Oh, yes. They float. THEYYYYYY FLOOOOOOOAT." - Stephen King's IT.

Yes, they float, so if you're underwater, they can't enter the water and harm you.

Answer 2

Yes they float due to the recent update in v.1.0.5

However, it means if your on ground and theres a little water nearby it means they can  speed up.

Slimes will bounce.

Bat and Hornet will attempt to avoid water.

Unfortunately, if your on multiplayer and lagging the hornets may enter water and ignore the rule.

Jellyfish, sharks, pirahnas and corrupt goldfish are the new addition to the game so it means the game is focused on different enemies.