Ideas of how the armies will be organized.
Aerial Alliance Dreadnoughts, Cruisers, Gunships, and Fighters Asari Dreadnoughts Salarian Dreadnoughts and Cruisers Turian Carriers Batarian Ships Geth Cruisers and Dropships Migrant Fleet Perhaps Rachni Ships, if they still exist
Planetside
Krogan
Rachni
Geth
Quarian Marines
Alliance Soldiers
Special Forces
Salarian STG
Turian Army
Asari Commandos
Mercenary and Pirate Bands (Most notably Blue Suns Eclipse and Blood Pack)
Perhaps Elcor with mounted guns and Auxiliary Volus Troops
Drell
Hanar is tough to say unless they have secret blasto status abilities
Raloi
Hahne Kedar manufactured Mechs
Other independent organizations.