I am liking the new site of mises.org. Does this mean that the rest of the site (the store, the forums, etc.) is being upgraded as well?
The answer to that is a fair and honest one. Everything is fair game for upgrading. The changes tend to come slowly. They probably have a priority list somewhere. I’m sure the institue keeps the few web developers they have busy. 
Well the community end has been in the works for quite some time. This will all eventually be rolled over to
For the new community, please consider XenForo.
It’s the best forum software on the market, developed by the key vbulletin developers who left after some nasty company politics and the code is 100% respecting model-view-controller, so there should be very little integraton issues.
I have installed, and I administer xenforo on a forum I run.
It’s not the best software. In fact, it’s a waste of money for most web hosts. Free stuff installs just as easy and gets the job just as done.
I’ve done web programming, and that is a good way to develop software. But that doesn’t help in terms of administration or end-user use.