As a result of the various problems surrounding 1.6.7, we're pulling the release, and will re-roll as 1.6.8. The only blocker for rolling is the r896522, r896547 which addresses a regression found in the 1.6.7 tarball (and uncovered by the ruby bindings). As soon as this fix is backported, I'll roll 1.6.8.
In the meantime, please revert the r896522, r896547 group, as well as any other items which should be included in 1.6.8. Thanks, -Hyrum