I'm translating my own book(from Japanese to English).
The title is "Tarkovsky and His Time - Hidden Truth of Life".
It was first published as a paperback in April 4,namely, on Tarkovsky's birthday, this year,
I hope it will be published as Kindle e-Book in December.
Some places(citations) are not translation from Japanese, but English original sources,which I refered on writing the first edition. Other places are translation from Russian original sources, including recently published Diaries of Tarkovsky("Martirolog",2008) and memoir of his sister, Marina Tarkovskaya(2006).
So I would say the English edition will be more pricice from academimc point of view,though I am not a native English writer.

Below is the coverart of Japanese edition.