Shouldn't it be epsilon-05 instead?

This is Murakumo unit No.01. According to Mori anyway.
So, official gender swap? With how Blazblue works with their time/parallel stuffs, I won't doubt that this girl here really is Ragna(there's the heterochromia, scythe, and everything) from whatever timeline. And you can always say Ragna(rok)=Apocalypse.