Por fin,después de muchas vueltas he conseguido algo parecido a una respuesta:
Thanks for the email. Phil has been very busy this past year, and hasn't had the time to respond to emails/send out art. In that regard, I have stepped in to help him out with things. I will speak to Phil this week, and then I will inquire about the status of your book. When I find out, I will let you know.
Talk to you soon.
Quien sabe que respuesta recibiré, pero después de un año esto ya me alegra :)