Twitter just updated their application to Windows 8 with the inclusion of lists and multiple accounts management. This last is essential, as there are many users who need to manage more than one account.
Another important feature included in this update is the ability to punch lists and user profiles in the home screen. In the application page in the app store for Windows also comment that improved the overall performance of the app.
Of course, with these new features of Twitter application for Windows 8 is not complete, but at least it is now much better than when they released the first version last March.