Since some people have already commented on it, I am setting up this thread for discussion of the new forum upgrade. Feel free to post any new features/options you discover. I will add them all to this post for quick reference.
Things I've noticed so far:
-"Ignore Boards" in profile settings
-"unread" on each forum section (Nationals/Community/Archives)
-font face/size/color dropdowns in the post form
-"mark unread", "edit", and "go to full version" on the mobile site
-misc. text and font changes
-"show posts" in profile now has "topics" and "attachments" settings so you can see all topics started by a user or attachments submitted by them.
-"who's online" mixes members and guests, but has a dropdown option to only show one or the other
A new 2.0 theme to go with is planned for the near future. I'll probably make the un-skinned version available for everyone to check out soon.