Did they just reveal the ACTUAL names of the player characters?

[Desert Stream~]

imo actual names are still better then Sun/Moon, canon or not :p

 

[BettyNewbie]

According to Bulbapedia, it's "Sun" and "Moon" that are recognised as their so-called official names, much like how Leaf from FR/LG was referred to as that due to also not having a real name. Elio/Selene seem to function as the alternate fan-made names for those who don't want to call them after the game versions.

Or, more accurately, they're the names most fans call them. It's like how most fans call the FRLG girl "Leaf," yet many still prefer to call her either "Green" or "Blue" (matches better with the male PC/rival and is what Adventures and the Clefairy manga call her). Heck, loads of fans still call the Gen 2 boy either "Gold" or "Jimmy," even though HGSS canonized/retconned him as "Ethan."

 

[OmegaRuby and AlphaSapphire]

They'll be called Ult-Sun and Ult-Moon

Considering that the USUM characters are the same as those of SM, the manga will likely reflect that by simply giving them new outfits (like they did with Ruby and Sapphire, and later Diamond, Pearl (well, only the unfolding of sleeves...), and Platinum did).

 

[strangerhypno]

Considering that the USUM characters are the same as those of SM, the manga will likely reflect that by simply giving them new outfits (like they did with Ruby and Sapphire, and later Diamond, Pearl (well, only the unfolding of sleeves...), and Platinum did).

Oh yeah, that sounds more logical. I forgot the protagonist were the same, I was thinking B2W2 esque naming for some reason

 

[Hikamaru]

Oh yeah, that sounds more logical. I forgot the protagonist were the same, I was thinking B2W2 esque naming for some reason

And here's another piece of evidence that the protagonists are exactly the same characters, as the character selection screen tells us below:

Notice that in both the S/M and US/UM character selection screens, their icons are all facing in exactly the same direction, the only difference being the outfits and hair.

 

[Kieran]

I really don't think that whilst the characters might be the same person, having the same positions mean they are evidences to being the same.