have they offered any concrete reason for the delay? if not, it's probably one or more of the editors themselves. In that case you might want to look for an alternative platform for your work. And remember never to write for them again unless the argument to join their venture is compelling. I've had stuff languish for over a decadeI've been politely nagging them - mainly because my dean is nagging me - and so far, it hasn't made a difference. You're not the first person to say two years is nothing for a book.
