Highlights:
- Small download footprint
- Very quick installation
- Simple Installer – No installer options – (Just Accept EULA)
About LocalDB: http://blogs.msdn.com/b/sqlexpress/archive/2011/11/28/simple-installer-for-localdb-has-shipped.aspx
Download LocalDB
1) Goto : http://www.microsoft.com/sqlserver/en/us/editions/express.aspx , click on “Download 2012 RC0 EXPRESS”

2) If Windows Live ID sign-on was prompted sign in using your live id
3) Select Language and platform, Select “LocalDB”
http://www.microsoft.com/betaexperience/pd/SQLEXPCTAV2/enus/default.aspx

4) Wait till download manager completes downloading SqlLocalDB.MSI
Installation:
Launch Installer SqlLocalDB.MSI




Unattended Installation:
1: msiexec /i SqlLocalDB.msi /qn IACCEPTSQLLOCALDBLICENSETERMS=YES
Management tools:
You can install SQL Management Studio Express from
http://www.microsoft.com/betaexperience/pd/SQLEXPCTAV2/enus/default.aspx

Connecting to LocalDB
- Launch Management studio
- In Connection dialog, connect to (localdb)\v11.0

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References:
http://blogs.msdn.com/b/sqlexpress/archive/2011/11/28/simple-installer-for-localdb-has-shipped.aspx
http://blogs.msdn.com/b/sqlexpress/archive/2011/10/27/net-framework-4-now-supports-localdb.aspx