The script blocks (the code) that were front and center are now buried behind a few additional taps.
They've replaced buttons clearly labeled with text with icons that are sometimes cryptic even to me (let alone a 9 year old). Would you guess that an icon with an "i" is how you edit your code? I assumed it would just be some kind of read-only display of extended properties, not an editing capability.
And the worst and most subtle change is the de-emphasis of the X/Y Cartesian-esque grid. Before you had clearly labeled X and Y value textboxes and a grid with matching color-coded horizontal and vertical guide-lines to make it easy to understand the grid, and labeled light gridlines every 100 pixels. Now nothing is labeled or shown except while long-tapping to move a sprite's starting position. Anything that ties into math curriculum is a win (Cartesian coordinates, ordered pairs), and they took much of that goodness away in favor of a more "streamlined" UX.
I do like that they fixed the problem of moving large chunks of script blocks inside of the repeat loops though.