NIS 2013??

Hello, I am running NIS 2012 and updated to the 20.2.0.19 version when it came out.  Is that the same as NIS 2013?  I noticed that Norton is not selling anymore products with the year marked on them (like NIS 2011, 2012).  Do I need to buy the new NIS product to get the latest version on can I just renew my current subscription when it expires?