One thing I love about the XF software is that we can edit our PM's (called conversations over there) after we sent them! So, for people like me who often spot an embarrassing typo or missed word after hitting sent, it's great, you can go in and edit your message quickly. Long PM conversations also get divided, like the threads here, into pages, so if you have a long natter with someone, or a group, you don't have to scroll to death to get to the new messages, you go straight to them.
I saw that too. Love it. If that's what the new site is gonna be like, I'm thinking this move will not be as bad as I thought.