The intent, is that Epochtalk is a forum software, whereby you (or anyone) can create and support their own forum, much like SMF is the software that supports Bitcointalk. Bitcointalk will/should/could therefore be an instance on Epochtalk (one of many potential ones).

It is still in development, but you can take a look at it either by downloading and installing the software to create your own forum, or by using one of the available community generated test forums, created on Epochtalk:

Cryptos-Currencies.Com : First forum using Epochtalk
Coinbistro.com - Epochtalk testing grounds