All I know is that he played that not-so-bright Southerner in the Coen brother’s film Hail, Caesar! – apart from that, I’m not familiar with him at all. So there’s really not a whole lot to go by, until we actually see him in the role. Unfortunately, what they’re doing with Han Solo reminds me of the The Young Indiana Jones Chronicles, which was a glorified attempt to needlessly milk the franchise.
So I’m not sure whether we need all these spin-off Star Wars films, Disney’s obviously trying to maximise their returns after purchasing Lucasfilm. But must we see every character in their own stand-alone movie? It may never end.