I have been regularly checking FamilySearch.org's Family Tree to see what might be added or updated around the time of RootsTech and sure enough, there was an update of the Reference Manual available from the Help Menu. The new updated Reference Manual is dated 4 March 2013. Since these changes are made incrementally and not announced, you have to dig a little to find out what might have changed, especially since the Release Notes haven't been updated since 15 November 2012. I am sure the "new" developments will be announced at RootsTech.
Here is the addition or change I have found so far. Bear in mind that there will likely be more changes either this week or shortly thereafter. I am quoting from the Reference Manual.
Members of The Church of Jesus Christ of Latter-day Saints can sign in to help otherThe Reference Manual still lists uploading photos, stories and documents as coming. We have known for some time that photos could be uploaded and added to Family Tree and stories were added recently. The ability to upload documents has yet to be added. It is likely that all of these features will be prominently discussed at RootsTech and there may even be an announcement of the addition of new features.
registered users of FamilySearch.org use the Family Tree, whether or not they are Churchmembers. When you sign in as someone’s helper, you see the Family Tree as if you had signed in with that person’s username and password. You can then do work in the tree inbehalf of that person
Some of the areas most in need of development are the find duplicates and merge functions. I don't think the solution to these areas has been worked out and I would be really surprised to hear much about this issue at RootsTech. But I can always hope.
There has already been some publicity about linking FamilySearch.org to the LDS.org website and some developments that only affect members of the Church. I would still expect some comments and emphasis in this regard.
If there are any other major or minor changes to FamilySearch.org, I haven't yet picked them up, but I will keep my eyes and ears open and report any developments.