Using Visual Studio Online (free with 2 users) & Visual Studio 2013, we can create work items and edit them both in the Visual Studio Online web access and Visual Studio 2013.
But when edit a work item in Visual Studio Online we can not reassign it to the other member in the project. In Visual Studio 2013 we can.
Note: On work item creation all members are shown for selection.
The new identity control was deployed with the Sprint 74 release. You can simply start typing their name or part of their name & click Search. Over time, you'll have a Most Recently Used (MRU) list built-up with the people you commonly assign work items to. The new identity control will be released in a future Visual Studio update so that the experience will match. Brian Harry has some additional comments about it in his December 2nd Visual Studio Online Update blog post. That's a good blog to subscribe to in addition to the new features blog available here: http://www.visualstudio.com/news/release-archive-vso
