Some of the LUS321 look pretty beat up inside. I've sat in F seats that have curve inwards from way too many butts over the years. I would assume AA will announce a major 321refurb at some point. However, with many of the 321s still flying around in the US Livery I wouldn't expect it in the very near future.
I have to wonder if the LUS321 would be retrofitted with AVOD. I doubt but one can only hope.