Well, for anyone who’s asked this question, you’ll be happy to know that it’s already been written. In fact, so has book 3. They need editing and they need cover art, both of which are being dealt with as I type this – but otherwise, they’re done! If you’re looking for a teaser, scroll down The Descendants page for their book blurbs.
The final two books to the series (books 4 and 5) are due to be completed by the end of 2013, with release dates in 2014. So watch this space!