Re-watched it again, so many missed details!

The next spin-off series has already been in development for about a year, likely about Mel Medarda and Noxus.

Mild spoilers, although I guess anyone who wanted to watch the series has already watched it:

Without knowing the League of Legends lore not everything in the series is clear. For example, Heimerdinger's "death", he is a yordle, a creatures of the spirit realm and he is immortal, when he "dies" he only respawns in the city of the yordels, or the six-eyed raven which takes Jayce's hextech gemstone is a clear Noxus reference, there are so many other details you only notice after re-watching the series.

Surprising how many people missed that Jinx escaped the explosion at the end and flew away in an airship.