PR at backdrop/backdrop#4726 updates us to 41.3.1.

I couldn't find any substantial changes that affect Backdrop's CKEditor installation. Some notes about new features and how they (don't) affect us:

• List plugin is deprecated and DocumentList is now the only supported list plug. We are already using DocumentList
• New Dialog UI Backdrop provides its own dialogs and does not use any CKEditor plugins that use dialogs.
• Multi-level LIsts plugin This is a premium-only feature and not available in Backdrop
• New Case Change Plugin We could decide to include this plugin if we think it is useful.

So seems like a straight-forward update process. I followed the UPGRADING.md file and there doesn't seem to be any issues in my testing.

New Dialog UI

Haven't had a chance to take a closer look, but would this help us with notifications? That's still pending. We're using an alert at one place and other messages are simply missing (file upload stuff).

I don't think, this has to be part of 1.28. I guess, we can update CKE any time we need. Especially, if the changes are minimal, anyway.

New Case Change Plugin We could decide to include this plugin if we think it is useful.

Yeah, I like that one. It helps with the styling of headings + sometimes people copy/paste text from other sources where others have typed everything in all-caps (a habit for some on mobile devices). That feature allows fixing that with a couple of clicks.

...other features like the following also seem useful and pretty standard (content editors expect to have those available):

• import from Word
• export to Word/PDF
• Math Equations (.edu site content editors would appreciate that OOTB)
• Find and replace
• Table of contents
• Font family (would help in our documentation site when formatting code with monospace for example)
  ...if these aren't premium of course.

I don't think this would be a good idea to shove into 1.28.0 (today). Let's target this for 1.28.1, even though it's less-than-ideal that it will be in a bug fix release.