From their website:
As many of our fans, family, and friends know, our good friend and singer, Zoli Teglas suffered a serious back injury during a performance in Europe this past summer. A recent setback in his road to a full recovery and the additional treatment needed has made it necessary for us to cancel all touring activity for October 2012. We must allow more time for Zoli to heal.
We will be back out there as soon as possible and thank all of our fans for their support, patience and good wishes to Zoli for a speedy return to full health.