User blog comment:MisterWoodhouse/Pausing UCP migrations to resolve some critical blockers/@comment-271416-20200831140749

Currently, there are 3 editor options in Special:Preferences. Which is the 2010 and 2017 editors? (I guess the "source editor" is from 2010 while the code-messing VisualEditor is the 2017 one.) What about the third one, will it get moved to UCP or will it be discontinued?