The Blessed Isles has to be one of the most fascinating places on Runeterra
Just about every piece of art and narrative content surrounding this region has me endlessly gushing over how freaking awesome it once was, and desperately wishing I could know and explore more. The concept behind the Isles itself is just so remarkably unique within the greater Runeterra world: a highly-advanced academic society based around safety, peace, and learning above all else. Citizens of the Isles clearly had a very deep understanding of the arcane, never having to worry about scarcity or warfare due to the natural magic and white mists shrouding the land (which later became the Black Mist after the Ruination), and studied the cosmos all while practicing their own religions.
What these faiths entailed exactly is up in the air; though the "Eye of Providence" motifs scattered about the Isles' architecture piques my interest and could potentially hold a clue -- this certainly wouldn't be the first place we've seen employ eye-related imagery on Runeterra... could they have perhaps worshipped the Watchers?
Overall, I'm extremely happy we finally got more on this long-lost haven, having been one of the few who bemoaned the lack of information before. There's this prevailing sense of mystery and the unknowable to the Isles that makes it a really fascinating place to explore and learn more about. Hell, I'd love to see a champion from there some day (aside from Yorick, Thresh, and Maokai), and I'm definitely in the bandwagon of wanting a MMORPG just to be able to explore the world further.