1. There's a possibility of a temperature inversion or potentially climbing to VMC when the clouds and freezing level are low. Not guaranteed, but possible. The #1 priority is to get out of the ice. If you are IMC and have no way to tell where the ground is, best bet is to climb. No one has ever collided with the air.
2. Water droplets can actually be cooled below freezing without turning to ice. This phenomenon is called super-cooled water droplets. The water has nothing to freeze on since it is suspended in the air. But if it is super-cooled, the moment it touches something (wings) it will freeze. Below -20 degrees it is highly unlikely there is anything liquid, but between 0 and -20, you have to beware of the potential for ice.