Mariya Ise (伊瀬 茉莉也), the voice of
Eureka (ユリーカ), announced on her official blog that she is pregnant and got married in January. In December of 2014, she posted that she was ill and unable to attend the Persona 4 Ultimate show. It is most likely that she will have a few months of maternity leave later this year similar to
Musashi's voice actor Megumi Hayashibara leave during
Advanced Generation.
Source:
http://ameblo.jp/mariya-i/entry-12010043830.html