There are already 5 movies (also available on DVD)
These are
No, Alan Cumming has never appeared in a Harry Potter movie.
No, nor was she in any of the Harry Potter movies.
There aren't going to be any more Harry Potter movies, so no.
No because he has nothing to do with the Harry Potter movies.
No, Christopher Plummer was never in the Harry Potter Movies.
That doesn't happen in any of the Harry Potter movies.
Max Lloyd-Jones was not in any of the Harry Potter movies.
no she is not
The HARRY POTTER movies are produced by Warner Bros.
Violet does not appear in the Harry Potter movies
Christopher Lee has never been in any of the Harry Potter movies.
Pressumably there WON'T be any more Harry Potter Movies, unless J. K. Rowling decides to write more books, which is doubtful.