Hi,
So I actually went into this more on Twitter but people didn't see the rest of the Tweets.
We do our planning quarterly, more or less. As of right now July 27, 2018 we don't have one planned.
We also don't have all the skins for 2018 planned yet, but we have the big beats.
We start planning in 2019 soon, because we know certain things: We know what Chinese Zodiac year it is. We know which Legendaries we're considering, which champ needs a skin, which new thematic we want to try.
We do not plan things for 2019 in July 2018. :)
You can see the thread here https://twitter.com/TheStarWeaver/status/1011775228584845313