Yesterday I have downloaded and installed Windows 8 Developer Preview to a virtual machine. You can see few screen shots below
Left most screen shows Lock screen of Windows 8 (it is like my Samsung Galaxy S2 Lock screen)
You can use the Windows live account to login.
Tiles will work fine in touch enabled devices
Windows Explorer with ribbon
If you want to install windows 8 developer preview on a virtual machine this link will help you to do that (in simple language and step by step instructions).