Important Announcement for IEM v3.5 :
New Leagues : Serie B and Serie C
Coming Back : NWSL and Women's Soccer
New Rest of World Clubs : AS Pirae, Alashkert, Anorthosis, Astana, Aris Thessaloniki, DAC Dunjaska Streda, FC Flora, FK Jablonec, Kairat Almaty, Lincoln Red Imps, Maccabi Haifa, MOL Fehervar, NS Mura, Riga FC
New National Teams :
UEFA : Andorra, Armenia, Belarus, Estonia, Faroe Islands, Gibraltar, Kazakhstan, Latvia, Liechtenstein, Lithuania, Luxembourg, Malta, Moldova, Monaco, San Marino, Vatican City
AFC : Bahrain, Brunei, Cocos Islands, Hong Kong, Iraq, Lebanon, Malaysia, Mongolia, North Korea, Northern Mariana Islands, Palestine, Philippines, Réunion, Singapore, Syria, Taiwan, Thailand
CAF : Angola, Chad, Gabon, Kenya, Niger, Sierra Leone, Togo, Uganda, Zambia
CONCACAF : Cuba, Curaçao, Dominican Republic, El Salvador, Greenland, Guatemala, Nicaragua, Panama, Puerto Rico, Trinidad and Tobago
OFC : American Samoa, Cook Islands, Fiji, Kiribati, Federated States of Micronesia, New Caledonia, Norfolk Island, Palau, Papua New Guinea, Samoa, Solomon Islands, Tahiti, Tonga, Tuvalu, Vanuatu
CONMEBOL : Falkland Islands, Suriname
Miscellaneous : Antarctica
A lot of other new features coming in IEM v3.5 such as 2022/23 season update, with new transfers, kits, and more
Compatibility with all languages
As for IEM v4.0, if it comes out in FIFA 22 :
New Leagues : Superleague Greece, Egyptian Premier League
IEM v4.0 is still being planned