The sun fluently transforms from the first camera setting to the second, right?
Yes, probably - because AC is providing a calculates sun position each frame - ensuring the sun smoothly moves through the animation.
If you can fix the fov thing... does that mean that in future it kight be possible to fluently animate from ie fov 35 to 65?
If AC provides the FOV at each frame, and it is smoothed between the camera positions, then yes. However at the moment it doesn't appear AC is providing the FOV at all for Photorenderer processes.
And willl it also be possible to do animation with camera aperture change?
I doubt this would be possible in the AC plugin - sorry. AC does not provide any way to store different plugin values at each frame. Instead, export to Standalone and animate the aperture there (using the above script) - or load the exported ORBX into the Nuke plugin, where the FOV, Aperture, etc can be animated.
Paul