Since IPv6 is going to replace IPv4, should I develop my new application to support it?

Question

I develop applications using many languages and a few platforms. From what I am reading, IPv6 is going to be mainstream within then next 5–10 years, and that some ISPs even offe

Answer 1

Security researcher Steve Gibson spoke an amazing amount on this, to note that it isn't coming up in the near future. Here's a few links that give a little more info:
http://www.grc.com/sn/sn-199.htm -- Midway through, he starts talking about IPv6 in the transcript/podcast.
http://www.grc.com/sn/sn-200.htm -- A quick correction for a mistake in the 199 episode, and a little more detail.