The upgrade should only last a few hours tonight (starts at 10pm), but you will see several things come, and several things go. (And more things coming Soon™)
New vB Version, With New Editing Support (And Fun Mod Stuff). One of the features allows you to double click your post to edit it!
New Portal Software. Easier for you to use, easier for me to manage!
Better IE Support, and Less Queries (Faster Browsing)
New Posts cataloged by Database, instead of Cookies. When you log onto another machine, your new post counters will remain intact.
The DIG. Look for a much better version Soon™.
Sidebar. May come back.
User Stats, and the other vBPortal pages. Look for replacements Soon™.
Other Great Features!