Maybe he saw something bad we don't see yet and realize the comback may never come....
- Meego development is behind schedule. Judging by current progress I have some doubt whether we will see golden release of Meego 1.1 next month.
- Harmattan is affected by Meego developement pace.
- Symbian 4 is delayed.

But anyway, obviously he is pissed off by internal politics. Good luck to him and to Nokia....