St Hermans' Press is working on a new edition that will include more early early material about/from Fr Seraphim. It will also remove certain material related to the monastery's "situation," eg-bishops, etc, at the time of the last edition.
Also, I read the Cathy Scott book. It's very interesting, mostly letters written by him, and provides a good glimpse at where Eugene Rose was coming from when he became Orthodox.
Also interesting is Letters From Fr Seraphim, recently published by Fr Alexey Young.