New expansion - Ice and Fire

[Zhuangzi]

So I never thought I'd see another King's Bounty game but here's this on facebook today. Strangely enough I am playing Crossworlds for the first time in well over a year at the moment. It's so much better than Warriors of the North, unfortunately!



1C Company announces the release date of King’s Bounty: Warriors of the North. Ice and Fire.

Ice and Fire is the official DLC to the released in 2012 King’s Bounty: Warriors of the North.

King’s Bounty: Warriors of the North. Ice and Fire is scheduled to be released digitally on January 30th 2014.

Ice and Fire features:

Creature skill system – lead your troops through dozens of battles and they will become stronger than ever!
Snow Elves – a new Elven nation that prefers snow and blizzard of the Ice Gardens instead of the green forests of Merlassar.
Necrolizards – a new kind of the undead, Lizardmen that have risen from the dead.
New locations to explore.
Over 20 new creatures.
Revamped creatures of King’s Bounty: Warriors of the North.
New items with unique attributes.
Over 20 hours of additional gameplay.

http://kingsbountygame.com/

My question is: is this DLC a SEPERATE 20 hour campaign or is it added on to the main WoTN campaign? Personally I'd rather a separate campaign so that I don't have to grind my way through the tedious WoTN campaign again...