The two column edit conflict handling is currently in beta and regarding your post: Clearly, in comparison to the 'old' edit conflict handling it uses more elements, colors and dialogue boxes. To help new users there we show a small walk-through tutorial on first sight.
With all that we try to solve the problem, that users in the past a) had no idea what happened or whether something has happened at all and b) found it annoyingly complicated to resolve conflicts with the 'old' interface. We gathered feedback around that from many editors and as a result came up with the current version.
However, this is a beta feature test with the goal to find out, if the workflow of the new interface works well under live conditions. For this, any feedback is welcome and valuable to improve the current version of the feature. So far the reception was quite good, but also some users pointed out that the interface could be more intuitive. So we are open for suggestions and ideas.
p.s.: As edit conflicts do not appear quite often we are currently working on a simple way to simulate them with the new interface so users can test it more easy without having to wait for a conflict to appear. If you're interested I will get back to that in this thread as soon as it's deployed.