No, Mr. Dheer. The Govt has currently no plans to introduce Rs 20 coins despite the fact that it may be economically sound idea.
For me the reference coin in South East Asia has been 10 Baht of Thailand. In last one year, its value in terms of Indian Rupees has gone up from Rs.16 to Rs 19, having touched as high as Rs. 21.
From that point of view, one could justify a coin of Rs 20.
However, shifting of note-coin boundary is always a very sensitive subject. ( Note- coin boundary is where the currency note becomes less viable than a coin and ideally, that denomination should be coinized).
In India, the boundary is fuzzy as there are both notes as well as coins for the denomination of Rs. 10. In Euroland, it is clear at Euro 2 and Euro 5, as is in most countries (which have coins ) . Only country which has fuzzy boundary is USA which has that fuzziness on the boundary of US Dollar 1.
India has frequent bouts of shortage of coins ( for reasons beyond the scope of this reply) and therefore currency notes of Rs 10 are regularly issued. As a matter of fact, when this boundary was at Rs 5, there were instances of Rs 5 notes making appearances, to overcome shortage of coins.
There are plans to enhance the capacity of mints as well as plans to introduce polymer notes which increase the life of notes and thereby deferring the shift of note-coin boundary. Let us wait and see.
Meanwhile, issue of QA coin with face value of Rs 20 has little relevance to face value as they are not issued at that price. One could put any face value ( 50 or 100) since they are collector edition and face value is indicated only to make it NCLT or parhaps ensure that collectors have something to tell their wives ( or husbands, as the case may be :-) )