NOTE The Minecraft developer TheRaddestBro posted a gif on the MC discord.
After seeing the gif i decided to make an addon for it. It works the exact same as in the gif. I did create this addon, it was just inspired.

So a Nether Pearl can:
PROS

• Do 3 hearts of damage to mobs that you teleport into
• Briefly light mobs on fire
• Teleport you

CONS

• More "gravity" than an Ender Pearl
• You take teleportation damage just like Ender Pearls

There currently arent many cons. So they work very similar to Ender Pearls.
The Nether Pearl replaces snowballs in this addon.
I will maybe update it later and add an "Ice Pearl" or something depending on what the he shows on discord.

I also talked to TheRaddestBro so that is how i know how the Nether Pearl is supposed to behave.
If you want to talk to him about it tell him that CaptainJoe sent you and he will understand.

This is a size comparison/texture comparison to an Ender Pearl

Download:
Resource: http://www.mediafire.com/file/r3k1gss6i9z9r5b/NetherPearlRP.mcpack
Behavior: http://www.mediafire.com/file/e8lycta2klodf9w/NetherPearlBP.mcpack

TheRaddestBro's Gif

[video] [/video]