As I’ve mentioned many times now, WordPress 4.1’s new distraction free writing mode is incompatible with Just Writing. As such it requires a completely new approach for Just Writing and lots of new code.
I now have a working version of Just Writing up and running on WordPress 4.1 and over the next few days I’ll test it on some production sites to make sure it works as expected.
That should mean Just Writing 3.5 will be out sometime during the first week of January.
For the next couple of releases I will treat the new code as beta quality, with the “official” support starting with version 4.0.
Expect some bugs and probably quite a few releases until 4.0 gets complete.