Considering this is Nexon, the new mode is going to suck. They still can't even keep people from glitching and guns being glitchy and everything being glitchy and laggy, I doubt this new mode will be anything to flip out about. The ony reason they are releasing new content is because too many people complain about how boring and annoying the glitches are now.
Nexon's routine (if you've ever played since they created Maplestory)
Player: "This buggy and glitched"
Player: "There's so many hackers help!"
Player: "This doesn't work to way you say it's supposed to!"
Nexon: UPDATE! NEW CONTENT COMING! WHAT IS EVERYONE IN FOR!?!
This is their typical way of "fixing" things without really doing any work. They leave all the original content buggy and glitchy and release new buggy glitchy content and hope it works out in the end.