Nexon Korea just released a lengthy new trailer showing off a lot awesome features the game has to offer ranging from character customization, transport, housing system, user created content, wardrobe system, mini games, and more.
There were other trailers released before this one, but I found this one to be the most interesting out of them all as it reveals a lot of key features of the game. Even without understanding a word of Korean, the trailer should give players a general idea of the game. I also linked a nice English wiki that I randomly found below. Perhaps a nice foreign community can start gathering there before the first beta. Definitely looking forward to playing Maplestory 2 and Tree of Savior. Hyped!