Boy! You didn’t even wait for the ink to dry on the announcement!
Start your stopwatch …
No-one even has the systems yet as well as had the time to even take a peek inside on whats changed (if anything). It will likely be a good month before we’ll have any clues.
As for the RAM access looking at the gallery we can see the door release button is still present just above the power outlet. So unless someone goofed on the pictures it appears the RAM is still accessible from the back.