I've been playing Minecraft on-and-off for the better part of the decade now (since I was 9 or 10 wow!), I've been amazed at some of the recent changes that Mojang has made with improving game engine performance and now this new caving update.
I hope they once again push for a revival of modding multiplayer servers, although that is most likely a pipe dream because of the Bukkit DMCA issues in 2013-2014 :(.