Arc System Works (most well known as the developers of the Guilty Gear and BlazBlue fighting game series) have announced that they will be cooperating with Lab Zero Games to publish the PlayStation 4 and PlayStation Vita versions of Skullgirls 2nd Encore in Japan. Alongside this announcement was the reveal that the game will also feature a full Japanese voiceover for its overseas release courtesy of the Japanese publisher!
While the full cast hasn't yet been revealed, the Japanese games site GamesTalk divulged that Filia's Japanese voice actress will be Ayana Taketatsu, well-known for her roles in both anime and video games. She has interestingly enough worked on dubbing an English game before, having voiced Anderson in the Japanese dub of Call of Duty: Black Ops II.
It's unknown if territories outside of Japan will eventually have the Japanese dub backported to them, but Lab Zero have stated that such an occurrence is unlikely to happen with the international PS4 release due to licensing costs.
Source: Skullheart Forums