If you go to your settings page you'll notice a new section called "Profile page". Here, you can customize which 3 videos appear on your profile page as well as replace your portrait with a video (they have to be your own videos). We've also cleaned up the profile page design a bit.
We've also modified the "online now" feature. If a user has been active on Vimeo in the past few minutes, their portrait will have a light blue border. We've actually had this for a long time but it was previously a boring grey border and wasn't documented, so it's kind of like a new feature!