When I read blog posts at http://jaaksi.blogspot.com/ I think that Ari Jaaksi was very proud of the things he/ his team did at Nokia and he identified himself a lot with the company over all those years.

So, for me it's not clear why he left. Even more when there's no statement from him putting it into a better light.

I hope those decisions are well studied and I just don't see behind it.