Looking through my old Monsters of Faerûn book, and I noticed that the monster in the first picture (from the D&D Beyond page for Adventures in Faerûn) is totally an ice serpent!!
After seeing this image, I now want a wemic PC species, solely so I can play Dirk Thunderkick, a spellcaster who speaks exclusively in dated slang, and talks way too loud.
"RADICAL!"
The 2e and 3.5e spirit dragons didn't have breath weapons, but had a "waterfire" ability to create fire underwater. I don't doubt that they'll have a breath weapon though in 5e!
"Dive into adventures set during iconic Netherese events, and face terrifying new monsters, including several new phaerimm."
So not only are phaerimm confirmed, there's gonna be more than one type! Neato!