Reddit reviews Attack on Titan: Before the Fall (Novel)
We found 2 Reddit comments about Attack on Titan: Before the Fall (Novel). Here are the top ones, ranked by their Reddit score.
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Links for the 2 english volumes: Before the Fall and Kuklo Unbound
For other languages I don't know.
As far as the novels go, the one with Angel is currently out in English (http://www.amazon.com/Attack-Titan-Before-Fall-Novel/dp/1939130867/ref=sr_1_6?ie=UTF8&qid=1412974137&sr=8-6&keywords=before+the+attack+on+titan), but you're right, so far there's no dates for the other two, as far as I'm aware.