They've published an article about their experiences:
The size of the map was about right for the number of players we had (approximately 20). It certainly isn't the size of some of the BF maps, but is of a size that keeps the momentum going and allows for plenty of freedom.
I felt it was well balanced and evenhanded, regardless of the type of preferred game style. There were plenty of opportunities for those that favored a faster paced run and gun approach and plenty for those that preferred a more quiet and stealth approach. The processing plant was of a good height providing many elevated and covert areas for the sniper fans.
I saw additional other maps during my time at Crytek and while I can't elaborate further, they certainly did look very diverse and where in variety of different environments...