Board Thread:General Discussion/@comment-4436775-20130713014204/@comment-4503347-20131209132707

Comparison of new scene showing Iyuli and that from old beta footage:

https://twitter.com/Yuki_flakes63/status/409951163153276928/photo/1/large

This suggests the maintenance reworked some of the CG scenes, especially the maps, in order to avoid politically-induced issues. Back then the CG scene before the mission briefing of Great Migration showed "(East Sea)" labelled just below "Sea of Japan". East Sea is the Korean name for the said sea, and given that Japan and Korea are involved with several issues, this is likely to be a reason.