Oracle 11gR2 has been released for linux x86 and x86-64 platform. Software can be downloaded at http://www.oracle.com/technology/software/products/database/index.html
Guys start downloading..:) ..
Note: - As of now documentation link is not available on http://tahiti.oracle.com (13:30 G.M.T)
Update : - Thanks to H.Tonguç , documentation can be accesed at http://www.oracle.com/pls/db112/homepage?remark=tahiti