MangaGamer had announced during Anime Expo 2015 that it'll release a Steam version of Umineko-When They Cry. This version will feature an updated English translation of Witch Hunt, new sprites and the full original soundtrack. MangaGamer's 7th Expansion site can be found here.
The original "Beatrice" and previous Endless Witch before the more well known Beatrice, Virgilia is the name assumed by this character after passing her name and title to her student. Her name comes from the Divine Comedy character Virgil, who guides Dante through Hell and Purgatory to Beatrice, who is his guide through Heaven. A powerful witch in her own right, she is Beatrice's teacher and possesses a connection to Chiyo Kumasawa.