As stated in my other thread, see the Announcement.
I've also copied/pasted the content here:
Originally Posted by Me
Many of you will see threads displayed in a new manner. If you wish to switch back to the Classic method of displaying threads (userinfo on the left), please go to:
User CP > Edit Options > Thread Display Options > Postbit Style > Classic
If you wish to keep it as is, simply do nothing.
Thanks,
Daniel