This is an updated release of Ougon Musou Kyoku: Cross, which was in itself an expansion of Ougon Musou Kyoku. Cross adds Rosa, George, Bernkastel, Lambdadelta, and Black Battler, along with a full story mode and tons of amazing music from the series.
http://store.steampowered.com/app/550340/Umineko_Golden_Fantasia/
Full disclosure: I was also the editor of the fan translation for the original game.
http://www.romhacking.net/translations/2057/
So to compare:
Here's gameplay from the fan translation if you like: