With Windows 8 Consumer Preview released I thought it would be good to clarify for our users which SQL Server Express versions will be supported on Windows 8. Here they are:
SQL Server 2008 Express SP3 and above.
SQL Server 2008 R2 Express SP1 and above.
SQL Server 2012 Express.
Additional Notes:
SQL Server 2005 Express will not be suported on Windows 8.
SQL Server Express is not supported on Windows on ARM.
I hope you find this summary useful.