Nope.
Naga are a tricky one.
Having snake like bodies make them difficult to implement. But, were on the table as a possibility before:
"Naga were initially planned to be a playable race in classic World of Warcraft, alongside demons and goblins.The concept was supported by the entire team, with the exception of the animators: according to Johnathan Staats, playable naga were cut entirely due to art-related reasons, specifically issues with putting them on mounts and the way armor would look on them. Their large spikes would conflict with wearing armor, and Staats relates playable naga's armor to the experience of playing a druid and finding it frustrating to not be able to see one's character's gear while in animal form, as most armor pieces wouldn't have worked on naga and thus wouldn't have been visible. Ultimately, one WoW developer created a concept sketch for the naga that ended up being used for Warcraft III, solidifying the naga's appearance and preventing them from being implemented as a bipedal player race in WoW."
"In a behind the scenes interview for The Burning Crusade, Chris Metzen stated that he would still like naga to be playable one day along with goblins (who later became playable in Cataclysm) and ogres. Greg Street has commented that incorporating naga as a playable race "would present some unique challenges, such as lack of pants."
Perhaps, the Sethrak could be used as a protoype, due to their very snake-like movements.
Thin Humans are, definitely, an option. Being based on the female Forsaken model, they are, pretty much, in the state Kul Tirans were before their addition - lack of customization options and a female model. Having average looking humans and big, burly, ones suggest that only the thin kind is missing to complete a "set".
Mechagnomes were, obviously, going to be playable. Having been shown on Blizzcon alongside a female model, different customization options and the the fact that they were based on the Gnome skeleton. Transmog was just an outcry.
Nightborne, as well.
Having had female models, different customization options, updated textures and a skeleton based on the Night Elf, pretty much grounded them as ones. We were just skeptical because we haven't had Allied races before.
Look at the Vulpera. So much work and effort was put into them and we knew they were going to be playable, even though the developers denied it.
Jesus christ... you are fun, you know that? -_-
The Shadowlands covenant races are going to be playable. Mark my words.