The rough breakdown is:
WW1 Redux
- 1916-1918 - Arras (Northern France) - medium sized map with dynamic seasons. Entire aerial combat section of the war in a single campaign.
Fokker Scourge
- 1916 - Ypres (Belgium) - small spring map. Fokker E.III vs DH.2 & Nieuport.
Bloody April
- 1917 - Arras (Northern France) - medium sized spring & summer map. German Albatros fighters wreak havoc.
Tanks at Cambrai
- 1917 - Cambrai (Northern France) - medium sized winter map. Introduces the new British superweapon - tanks!
Final Months
- 1918 - Amiens (Northern France) - large summer & autumn map. Features all the late-war planes.
Some screenshots of the various seasonal textures:



