Translation: I'm pedantic about the way people name the unannounced console, which is known to be in development.
so, ok, it's most likely not gonna be called Series S, that name is just chosen by people because of the current Xbox One model names being similar and everyone knows what you mean when you say Series S
I agree that it will most likely not be called series S, the first issue would be that it would be the "SS" when you shorten it... and the Xbox SS would be a popular branding among Nazis for sure, but not among the rest of the population
BUT now I have to be pedantic back to you.
because Microsoft already confirmed that "Xbox" is the name of the next gen and Series X is just a system among this new generation simply called "Xbox"
my bet would be it will either be called the Series X Lite (or something similar) or they'll use another letter like Series D for "digital" or maybe Series L for Lite... maybe Series H or HD to make it obvious that it's meant for DD TVs
given the newly shown boxart tho, with the Series X badge and the listing of the consoles on the top Left only including Series X and Xbox one, I lean more and more in the direction of Series X Lite, Series X Mini or Series X Slim