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Actually that map isn't bigger at all, it shows us only areas that we know of already.
Compare:

 Spoiler

You can see Rien (The horseshoe shaped island), Leafre (the dragon) and Ludus Lake (the 2 islands just above the compass).
In the bottom right corner you can see Commerci, and just above it is the spooky forests of Tyrenum.

The only areas shown on there we didn't know about are the mountains just under the compass, and the rather big island which Temple of Time seems to be floating above.

I have to hand it to Nexon, they are doing a really god job of expanding Maple World and making it fit.

Also the continent is starting to look like a dragon with horns ;3

Well apperantly if you look at the world map you can see the little island near Temple of Time... So this island not new