Installation SQL Server 2012 - “Ready to Install” page missing
Ok, I found the solution... 

When you have SQL Server 2012 EXPRESS edition, and you want to get ConfigurationFile.ini from your installation process, you have to: 

1) Run downloaded exe, which will unpack your setup.exe to C:/231231231231...sth 

2) Cancel installation. Go to that dir via cmd. 

3) In cmd run: 
setup.exe /ACTION=INSTALL /UIMODE=Normal

Express edition is run in AutoAdvance which skips "Ready to install" and ConfigurationFile in general.. not sure why.