The recent controversial changes in Nautilus 3.6 have made different distribution developers to think the other ubway. While the Linux Mint team is busy developing a fork of Nautilus, Ubuntu developers are thinking to drop 3.6 series Nautilus in Quantal and use 3.4 instead. Sebastein Bacher, a software developer at Canonical posted in a bug in Launchpad that Ubuntu 12.10 may go back to use Nautilus 3.4 even though 3.6 are in the repos.
we are looking at going back to nautilus 3.4 for quantal but it's good to have a good view of the issues with the new version
Also, they are interested in joining hands with Marlin or Nemo teams to bring out a fork of Nautilus more suited for users.
Looking around us "elementary os" has its own filemanager (marlin, written in vala), "mint" just started their own project "nemo" which is a fork of nautilus 3.4 ... we might decide to follow GNOME, try joining efforts with the marlin or nemo team to maintain a full featured file manager or maintain our own filemanager (less likely at this point, that's not a topic which was raised before)
It remains to be seen what happens next in Nautilus development in Ubuntu.