From the release announcement - "Guard the forest soul with Elderwood Hecarim":
"You’re walking into the forest, deeper than ever before. Sunlight breaks through the thick canopy, dotting the woodland floor in soft white patches. Here, petals from strange, unknown blossoms paint the path ahead brilliantly. You wade farther through the tangle of thick vines into a sylvan oasis. Sunlight fades and the oaks growl a low caution. A beast rises from a clearing ahead; its primeval form creaks under the weight of ancient slumber. It wakes to protect this realm.
Guard the soul of the forest with Elderwood Hecarim, now available in the League store for 975 RP until November 30 23:59 PST (1350 RP after that)."
Never relent! Continue scrolling for preview pictures and video:
Here's a 1920 x 1080 version of the Elderwood Hecarim splash art!