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The game mode is discussed in parts in these articles:

https://www.pcgamesn.com/steel-divi...ormandy-44-units-phases-multiplayer-divisions

https://www.rockpapershotgun.com/2017/03/06/steel-division-normandy-44-preview/

http://www.pcgamer.com/steel-division-normandy-44-is-a-realistic-ww2-rts-coming-this-year/

Just to warn you, you might not get a huge number of answers to your question. The closed beta started today and all involved (potentially a fair few forum members) can't divulge any information related to the game.
 
Are you asking about the phase system or the victory/defeat conditions? The latter involves taking control of a majority of the map as far as I can tell. There's no control points though just a frontline that divides the two factions territory and is pushed back and forth by unit movement(units can get surrounded behind enemy lines as a result).