It's alright. Here's what I think from my experience so far...
Pros:
-Dragons are important
-Botlane Alcove seems alright, though I prefer a little bit less of the bushes creeping into it as it looks off visually
-Item changes
Cons:
-Terrain changes seem cheesy/corny. Like, "oh that's cute." Okay okay... I just wanted a river of Lava when the infernal dragon takes the map.
-I think the dragons are overloaded. We get passive buffs and then a special ability unique to the dragon that takes over the map. Kinda too much if you ask me, especially if you add the elder dragon(even though it's rare and I've only seen it twice so far).
-Rift Herald changes seem off. This was a good opportunity to bring Vile Maw into Summoner's Rift as well.
-Toplane Alcove. Do we really need one up there? It irks me that the map is trying to mirror itself by design with such an iffy addition. It's like they just copy+pasted it up there ...