User blog comment:Sarah Manley/A Facelift for the Edit Page/@comment-33628828-20110414015117/@comment-126761-20110414111928

To reaffirm: not removing source mode editor. Not removing MW:newarticletext. Not removing licensing notice.

This is just an updated layout, the main functionality is unchanged. So for complex main pages, it would still automatically fall back to source mode.