Well they've Osborned Symbian and Meego smartphone app development, but I'm not all that sure there was room for a fourth (and fifth?) app ecosystem anyways. The OSS fanboys and ABMers certainly have their panties in a bunch but it's hard to tell what serious developers for those platforms are thinking. At least if you don't trust Nokia anymore, developing for WP7 won't tie you to their hardware.
Still, I worry what this means for Qt's future. It's a nice platform but Nokia really has no reason to pour resources into it anymore. Maybe the KDE project will take on its stewardship.