At last oracle 12c database and grid infrastructure(linux versions) ready to download.
[oracle@12c ~]$ sql SQL*Plus: Release 12.1.0.1.0 Production on Wed Jun 26 23:05:30 2013 Copyright (c) 1982, 2013, Oracle. All rights reserved. Connected to: Oracle Database 12c Enterprise Edition Release 12.1.0.1.0 - 64bit Production With the Partitioning, OLAP, Advanced Analytics and Real Application Testing options SQL>