Package: network-manager Version: 1.0.10-1 Followup-For: Bug #809195 Seems it has been fixed in last network-manager release 1.0.10-2 as stated on archlinux bugstrack (https://bugs.archlinux.org/task/47535).
Hope it can be pushed fast to sid too; meanwhile you have to delete your default gateway manually and enter the new one using the route command.