Just saw the press conference regarding final rupee symbol.The new symbol will appear on every Indian banknote in next 6 months,however they didn't say anything about coins,so coins may remain as they are.
The symbol has been designed by IIT(Indian Institute of Technology)Mumbai student D.Uday Kumar.He said that he was working on the design for more than 3 months.He first designed about 100 symbols,then shortlisted 10,and then decided to send this one for the final competition.
The symbol shows a Devanagari र (of rupee),it also resembles Roman R with the vertical lines missing.The top two horizontal lines correspond to equality sign,and the upper half is also identical with the (mirror image of) euro sign.
Aditya