This is new for me too. I am pretty sure I haven't had the editor like that before, but checked it now and it is there. All the time until yesterday when I wrote something on Steemit I couldn't change between the editor or the normal markdown style, now I can. :D That's some amazing upgrade for me :)
I know, right? It’s new. The people saying it is not new must be sorcerers. It’s new. To us, it is. Haha 😂
It is definitely new lol but what I learned from it is, that if you start working in one of both, you can't switch to the other one, that is somehow a bit sad, but understandable.