Everything is cache busted on an update, except for icons.png, all the icons are out of whack on the 4.3 update.
I've tried going into the CSS/JS, adding a ?v4.3 to the end, but no joy when forcing a refresh.
We don't want to ask users to clear their browser cache, any ideas on where to manually go to add a cache busting timestamp for this resource?

Unfortunately it's trickier
Unfortunately it's trickier than in case of other resources, because icons are linked from CSS. I think that by updating the URL there, we would solve the issue, but this requires changes in the CKBuilder. Anyway, here's a ticket: http://dev.ckeditor.com/ticket/10685.
Piotrek (Reinmar) Koszuliński
CKEditor JavaScript Developer
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I upgraded my test Drupal
(2013/12/14 updated to correct CKEditor version number)
I upgraded my test Drupal site to CKEditor 4.3 and successfully tested a bunch of functions. The IE11 support is much appreciated! However, when I updated my production site, the toolbar icons were only partly there (screenshot attached). Am I seeing the same problem described in this thread? It is quite possible that the image files from the test server were not cached prior to the upgrade (I haven't been on the test environment for a while). The ticket refers to v4.1.x and does not show a fix or bypass.
Thanks, Norbert
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Clearing Browser Cache may not be enough
In my case, I am behind a caching server. A 'hard refresh' in my browser will cause the caching server to refresh the page but not necessarily all elements in the page. As a result, it continued to serve up the old icons.png file. I ended up manually removing icons.png from the caching server.