Except for a FB post (its official - 4th pf and 3rd pitline for kakinada) , there was no news anywhere regarding the 3rd pitline and havent spotted any tender regarding the same.
Yes the site u were referring can be easily used for expansion of C&W. Keeping Pitlines aside, parking line are needed on priorty. there's still a lot of unused slot in the current 2 pitlines itself.