this is Casaubons suggestions table for new weewar.com terrains. for new unit suggestions see this table. for new game mode suggestions see this list.

TERRAIN
Infantry Modifiers
Mechanized Modifiers
Naval Modifiers
Special features
Attack
Defense
Move
Attack
Defense
Move
Attack
Defense
Move
  
Plains
  
-
-
-
-
-
-
n/a
n/a
n/a
  
Woods
 
+2
+3
+0.3
-
-3
+1
n/a
n/a
n/a
  
Desert
 
-1
-1
+1
-
-
+0.3
n/a
n/a
n/a
  
Mountains
 
+2
+4
+1
-3
-2
n/a
n/a
n/a
n/a
 Mechanized units can only move by road onto mountains.
Swamp
 
-1
-2
+0.7
-2
-2
+1
n/a
n/a
n/a
  

same as terrain below
same as terrain below
-0.3
same as terrain below
same as terrain below
-0.7
n/a
n/a
n/a

Roads placed upon other terrains improve movement of land units and do not alter combat effects of forest, sand, mountain or swamp below.
-1
-2
-
-2
-3
-
-2
-1
+0.7
 Bridges can be crossed by all units. Big boats and land units have weaker attack and defense on a bridge tile. Big boats can not enter bridge tiles if there is shallow water below.
Base
 
+2
+2
-
-
-1
-0.3
n/a
n/a
n/a
 Generates full income and can produce land units and hovers.
+2
+2
-
-
-1
-0.3
n/a
n/a
n/a
 Towns generate half the income specified for bases and can not produce any units.
Airfield
 
+2
+2
-
-
-1
-0.3
n/a
n/a
n/a

Only airfield modifies air units: +2 attack +2 defense +3 repair (also on neutral airfield). Produces air units.
Repair Shop
 
-
-6
-
-
-6
-
n/a
n/a
n/a
 Land units and hovercraft: +6 repair
+2
+2
-
-
-1
-0.3
n/a
n/a
n/a
 Produces cruise missile. Produces satellite in shroud mode. Produces nuke missiles in nuclear domination mode. If a player owns all sites on map and builds a nuke on every site he wins.
+2
+4 (+8 if captured)
-
-
-
-
n/a
n/a
n/a
 Bunkers have a defense modifier of +8 for infantry if captured.
Harbor
 
+2
+2
-
-
-1
-0.3
-

-1

-

 Produces naval units.
-2
-6
trooper +0.7
-2
-3

tank +0.7
-
-
n/a
 Access only for: trooper, tank, speedboat, hovercraft
Water
 
n/a
n/a
n/a
n/a
n/a
n/a
-
-
-
  
n/a
n/a
n/a
n/a
n/a
n/a
-
-
-
Subs have a better defense (+1) on deep water. Speedboats and hovers move slower (+1 modifier) on deep water.
-
-
-
-
-
-
-
-
-
 If all victory spots are owned by one color, this color wins in capture the flag mode.

Additional notes: Speedboat has no combat modifiers on bridge or harbor like other navy. Hovercraft has a -1 modifier on defense while on airfields and harbors.

What new terrain is the most interesting for you?
  
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see original Weewar Terrain Wiki here. see the actual discussion about terrains in the Weewar forum here, comments are very welcome