Though details have not been released, it seems that all of Bob Weir & RatDog's tour dates have been cancelled.
Here's the statement on the Furthur Facebook page, posted yesterday:
Circumstances have necessitated that all scheduled tour dates for Bob Weir & RatDog are being cancelled. This applies to all dates on the summer tour starting on Thursday, August 14 in Boston through September 14 in Nashville and also includes the Jamaica event in January of 2015. Full and complete refunds are available at place of purchase. We sincerely apologize for any inconvenience.
Hopefully, Bob & co. will be back on track sooner than later.