Yes, it is true. Everyone is now on the new Blogger interface. Some of you might have never used it, and now you are stuck in knowing what to do. Google made a video back when the interface was first created, and I'm going to embed that video below.
I personally have been using the new Blogger interface for a few months now, about a week or two after they first launched it, because the first two times I tried it I got lost and jumped back to the old interface immediately. After those two times, I was ok.
If you use Gmail or another Google service, the new interface should not be that much of a shock to you, as the interface is pretty basic across all Google services. I pretty much use Google for Blogger, but I also have a Gmail due to my Android phone. I have that forward to my Outlook account.