You can now choose between sorthing threads by their post date or by the newest thread / reply (post bumping) by clicking the "sort by xxx" link at the top and bottom of the thread list in a forum. You can also now choose how "mark all read" works. Just clicking "mark all read" works the same way it did yesterday and the same way it did in the old Rendo forums. However, "mark all before xx:xx read" marks the forum read since before you last entered it. That is, anything posted between the time you first showed up and the time you marked the forum read will still be unread.

-Nicholas