This day, i just open the official site of joomla and i found about Joomla 1.6 Beta released but until this time, i still not use its, because i'm not sure with the addos for that let me know how about you
This is beta. You have to wait for the final version before install it on a working site. There is no build in commentary module in this version
It's a opensource which is better compared to joomla 1.5 inside that we will use components, module, plug-in etc. this is one of the important opensource so that you can develop website easily.