without giving anything away, of course, how many 100% new effects shots like that Falcon approach will there be in the final product?

Assuming and only:

Some of the Hoth hangar shots will be replaced..

Ady said that the carbage shot in space is replaced/improved(?)

The new TIE fighter collision shot in the asteroid..

New wampa shots

The new bespin Arrival/exodus

New Rebel live action shots with the shield generator under Ming's Direction

New improved shot with the rebel medical frigate..

-Angel