Maybe the arc will be him talking down an evil Wesley Crusher who is ravaging the federation in his mind controlled hyper warp ship :-).

More seriously I wonder how members of TNG feel about this move. The original voyage cast got 7 movies the TNG cast got 4, and the Abrahms crew has at least 3 movies (probably 4 if IMDB is to be believed)

So the cynic in me thinks this is just a grab at trying to save the Discovery series from an early demise (like the Enterprise series) by trying to slot in a character from a successful show. This worked at least once with ST:DS9 after all.