* "To Catch a Thief", blue, Halfling Rogue (set in Waterdeep and starring Laeral Silverhand and The Xanathar)
* "Into the Jungle", green, Dwarf Cleric (a Harper and worshipper of Clangeddin Silverbeard, mostly set in Chult and tied heavily to ToA)
* "Big Trouble", orange, Elf Wizard (though very early in her apprenticeship; tied to some new version of Against the Giants that may or may not be SKT)
* "Escape the Underdark", red, Human Fighter (not yet read, but the title suggests at least a vague tie to Out of the Abyss)
Then in 2019, two more were published; "Escape from Ravenloft" is green and stars a Cleric, just as with "Into the Jungle", although this time she's human. I know the other 2019 title, "Mad Mage's Academy", only from a thumbnail, but it appeared to have an Elf on it, and it's blue like "To Catch a Thief", so presumably the character is another Rogue.
I will be quite disappointed if 2020 comes and goes without two new books being published, an orange one with a Halfling Wizard and a red one with a Dwarf Fighter, so that this second series is complete. I have no knowledge of whether the first six books sold well enough to justify continuing the line, but I'll be quite irritated if they don't complete the second cycle they started, so that these "iconics" are left forever unbalanced in their representation. (Now, if the books are successful enough that a couple more do roll out every year, I would hope that books 9 through 12 might explore other classes and races; we could have a Half-Elf, Half-Orc, Drow and Gnome of the classes Druid, Bard, Warlock and Monk, followed a couple years later by a Dragonborn Paladin, a Tiefling Sorcerer, and a Ranger and Barbarian each of some previously-unseen subraces. But that's me getting a little carried away.)
It did not, although they do appear in Mordenkainen's Tome of Foes, so their use in 5E is a possibility (much to my chagrin; I'd rather have had the more vaguely turtle-like desert-dwellers introduced in 3E, whose name escapes me at the moment). "Into the Jungle" does feature Grungs, a race of poison-arrow frog-people who are very different from Bullywugs, Sivs, worshippers of that Greyhawk god of frog-human racism (another name I can't recall), or other previous amphibian humanoids. It also features both aarakocra and pterafolk; the former are in the monster manual, while the latter are probably in Tomb of Annihilation along with the Grungs, not that I know for sure. Whether the latter mentions Tortles is anyone's guess.
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