Hi there THERMAX-CHENNAI!
Thanks very much for your anticipation of the new release!
Please understand that we are unable to comment on the upcoming release dates for the 2014 products.
I'd like to recommend you to continue watching the website for news of the 2014 release. If you are a Contract Manager, then you will also receive an email when the new release is made available in the Subscription Center.
I hope the above can answer your question.
The offline help files for Plant 2014 are already on the AutoDESK website. There is a section 'What's new'. Most interesting !!!
You can access this page directly from within AutoCAD Plant3D 2013 in the pull down next to the help (?) icon in top right corner