The new map is called Elver, it is a medium sized map. It appears to be a fictional region in Eastern Europe. NPCs and Quests are present on the map.
Around 20 new guns will be added to the game, of these we have seen(through the trailers) two Assault Rifles, one Sniper Rifle, one Shotgun, one Machine-gun and an unknown firearm which seems to be a bullpup weapon. There appears to be a new melee weapon which is shaped like a wizards staff.
As for vehicles we have seen one Police car and one Bus, the colors of the police car are purely aesthetic and is not referencing the police cars in a particular region.
There appear to be quite a few new items of clothing including a new set of military uniforms and a new military helmet. There also appear to be a new set of hooded robes in a dark shade. There is also a new item called a Respirator which can be crafted which seems to be a face-mask design to protect against toxic substances. There also appears to be new design of turret as well, the new turret is grey in color.
The weapons on the map have been created in a balanced way with regards to the map. the developers have also tried to reduce the number of magazines and ammo types presumably to make the map simpler. Also many of the vanilla items on the map have been modified and their spawns descriptions and names have been changed to suit the map better.
(Guys i have updated the main text in order to include all the new pieces of information we have found out)