Is there going to be a underland chronicles book 6?

there is a 6th gregor book called GREGOR AND THE TASKS OF SILEN

its three years later gregor is 15 lizzie is 12 and boots is 6. there is an earthquake that uncovers a new intrance to the underland and the gnawers come and steal back gregor to fufill a new prophecy to uncover the truth about gregor and luxa (love)