The second alpha has been released in the Ubuntu 12.10 development cycle. People who are wanting some new features implemented are going to disappointed; most changes are under the hood right now.
There are a handful of updated packages – including Firefox, LibreOffice and Ubuntu One – bringing some minor features/UI changes. Like I said before, though, most changes are under the hood.
Before you get happy, let me warn you. Alpha releases should be considered UNSTABLE, and you should not run this on real production hardware. Alpha releases are also intended for developers. Alpha releases should be taken for a spin in a safe virtual machine. Oracle VM VirtualBox is a great virtual machine program to use.