The new layout edit mode feature is great, it makes editing much easier. Negative change is: No more "what-you-see-is-what-you-get». The new layout edit mode adds more than 200px in height on every layout you add in an area. It also add extra vertical space in block and containers. That completely distorts the vertical visual layout view.
If the ConcreteCMS homepage praises WYSIWYG, - this edit view should really be improved.