Nexon recently released a new video for MapleStory 2, explaining the main design choices. For example, the “block” world is something which will allow all features planned to be implemented smoothly. If I did not see wrongly, 1 vs 1 PvP mode is also teased in the trailer below.
The development team did try various camera views, but eventually settled on the quarter view to allow other features to work cohesively (such as house building). The core usage of keyboard, a classic function from MapleStory, was also part of the development process.