So, I was taking a look around my profile, and thought, "I need better runes!" So, then I went into the shop, and I found our brand new shop, and while scrolling, A NEW 
SPLASH! This has not been talked about yet, so I might as well be the first to say it! :D Good luck, out there!
EDIT: So, I've been told, that this is not a new splash per say, just the Chinese splash currently replaced it as a placeholder.
DwarvenGiant3 votesIt's his Chinese splash, as far as I know. It appears every once in a while (In the LCS for example, for two years or so now). :P
Skaiserus1 votesCool, I honestly didn't know that! Y'know I might just play Pantheon for this splash! [slayer-pantheon-rainbows]
Kitty Whiskers2 votes"accidentally" [slayer-jinx-wink]
Skaiserus1 votesWell, if it was intentional, I wouldn't know. :P [slayer-pantheon-rainbows]
Blood Magicks2 votesIt looks really cartoony?
Skaiserus1 votesYeah, as DwarvenGiant said,
It's his Chinese splash, as far as I know. It appears every once in a while (In the LCS for example, for two years or so now). :P
Moonboy651 votesthat's Pantheon original Chinese splash art
Tesla Effect1 votesPictures or it didnt happen.
Moonboy651 votes[{quoted}](name=Tesla Effect,realm=NA,application-id=6kFXY1kR,discussion-id=NZdA8QYv,comment-id=0004,timestamp=2016-05-17T10:54:57.190+0000)
Pictures or it didnt happen.
it's a bug, Pantheon never received a new splash art (minus the Chinese art he currently uses)
Skaiserus1 votesI've changed the post to what it actually is. I'm sorry for falsely stating there is a new Pantheon splash.