I heard this on the beast's lair. Such great news. I had heard about Mahoutsukai back when I first got into Type-Moon. I'm happy it gets a release like this atleast.
Kinny Riddle: The summary is pretty clear in saying that it does take place in the same world. The story is about Aoko so it won't be talking about the Grail war or Vampires as much as it will talk about magic/magecraft (they are two different things mind you) aswell as her past and relationship with her sister.
The summary of the book goes as such
In any case. I love Aoko (as I love most major Type-Moon characters). I'm very excited for this.