I just installed SQL Server 2012 Express, I can connect with database from VS2012RC
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Database is working :) I use Win7 SP1 64bit
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I download program from page
I choose ENU\x64\SQLManagementStudio_x64_ENU.exe
I want to install Management Studio 2012, but after unpack installer has stopped. I see only for moment some console application.
You need to install ENU\x64\SQLEXPRWT_x64_ENU.exe which is Express with Tools (RTM release. SP1 release can be found here).
As the page states
Express with Tools (with LocalDB) Includes the database engine and SQL Server Management Studio Express) This package contains everything needed to install and configure SQL Server as a database server. Choose either LocalDB or Express depending on your needs above.
So install this and use the management studio included with it.