According to the official Walt Disney World website, the scheduled refurbishments for the Backlot Tour and Honey, I Shrunk the Kids Movie Set Adventure have been extended.
They will now both be closed through November 16, 2012. Both of these refurbishments will begin on November 1. No official word on what these refurbishments are for, but given the short nature of the refurbishment duration, it's likely these closures are merely for general maintenance.
Thanks to our friends at StitchKingdom for the update.