Since I usually login to Facebook both on the desktop and iPhone everyday, I tend to notice things out of the ordinary. Sometimes it's rollout of new features I've heard about and others I think it's just A/B testing.
The latest feature I saw was a different, more visual way to show Pinterest Pins. One of my facebook friends pinned a few things to her boards and they showed up in my timeline like this:
The tiles go the width of the timeline and graphically feature what she pinned. Moreover, there are "Like" and Comment links for each one. When you hover your mouse over images, a Pinterest logo pops up in the top left and you can click-through to the pin on Pinterest. This was the first time I noticed this new format and I like it.
More broadly, what I've seen Facebook doing is not necessarily about adding brand new features, but making existing features more readily available and customized based on the content. In this case, even though they're featuring the pins prominently, they're also featuring their own Like and Comment features very prominently. They've found a way to make the timeline more visually appealing while also encouraging interaction on the timeline.
Have you seen other similar formatting for other content on the Facebook timeline? I'd love to see!