Indian Rupee symbol has been announced and has been sent to the government for approval. And if you are wondering how will you type the rupee symbol using your keyboard, well it might take a year or so to get the symbol in action (to gain acceptance in India) and two years for international acceptance.
The symbol will also be included in the Indian Standards, viz. 13194:1991 – Indian Script Code for Information Interchange (ISCII), through an amendment to the existing list by the Bureau of Indian Standards. The ISCII specifies various codes for Indian languages for processing on computers along with the key-board lay outs.
While the Government of India can mandate hardware manufacturers to include the symbol in keyboards, it can also be accessed through assigned keyboard combination or via the operating system’s Character Map, post approval from the Unicode Consortium (via).
Here are a possible options you can think of (via):
using U+0930 (i.e. Devnagari Letter, RA)
i.e., U+0052 (Latin letter R), and
( U+20a8, i.e. Rupee sign).
Maybe, to get the official Rupee symbol, you would have to wait for the new keyboards or hack from a typographer.