Today I faced another "issue" with the brandnew CKEditor in FP2: they changed the dialog to insert an image from your disk. The following shows the differences:
Image dialog in FP1, CKE 3.x
Image dialog in FP2, CKE 4.3.2
In FP2 I use the Bootstrap skin, so results may vary - but there is no upload button anymore. Per Henrik Lausten reported that for him the image information screen is displayed after hitting the OK button. I never saw this. I tested in FF, IE11 and Chrome.
For some reason the function did not work for me in Chrome completely - no image was inserted after hitting OK. I first thought that this was a general Chrome issue and tested it again in a new incognito tab (without any extensions at all) - and it worked!
As I now knew the reason I searched for the extension that was responsible for that - and finally found it.
Ripple is the villain!
I like Ripple, the mobile device emulator for your browser. In this case you should deactivate it or use another browser where you don't have the extension installed or - as I do from now on - use a new incognito page to prevent the usage of any extension.
Found other issues? Please report them in the comments 