New Session Menu in Ubuntu 12.10
Your name display is gone as a space-saving improvement (Ubuntu assumes you know who you are and as whom you have signed in. This is all part of the de-cluttering of the user experience and for most people (the 200 million targeted new users) this should be fine.
For the rest of us, you just have to drop into the System Settings pane to see just how many settings are no longer available.
Various builds of Ubuntu 12.10 Alpha 3 can be downloaded. Remember that Alpha releases are intended for use by developers and testers and not those seeking a stable user experience. RC