One of the big changes in 19C is the uplift of administrative pages (aka professional landing pages) to the Newsfeed UX look and feel. It's coming to all users, regardless of whether you're still using the classic Simplified User Interface or the new mobile responsive Newsfeed UX. For customers still on the classic UI, this provides an opportunity to dip your toes in the water with Newsfeed UX without any configuration effort. For those customers already on Newsfeed UX, this makes the look and feel of the administrative pages consistent with all the other pages.
Here is a before and after screen shot example so you can get a feel for what I'm talking about:
Personally, I've found that the Search feature at the top of the page in the new layout is really handy. I don't need to scroll or try other navigation - just search for what I need. Nice cool factor for ease of use.
This brings me to a really important point: if you are an Oracle HCM Cloud customer who has not switched to mobile responsive Newsfeed UX, I have to ask why not? It is Oracle's strategic direction going forward - we're releasing more and more new functionality that ties into Newsfeed UX. So the longer you wait, the further behind you fall on benefiting from that new functionality. Is that really where you want to be, burping and chirping behind the curve while the rest of your industry grabs the gains of those new features? Just a thought... you can always sound off with your own perspective in the comments.