My guess is that we'll be very lucky if we hear any "new" songs and if we ever get a "new" CD I suspect it will be a "live" format.
But just as an exercise I would beg him to stay away from any of the topics suggested by the author(s), topical songs are cute for a week, if it doesn't gore your ox, but very quickly lose their luster. I suspect the canon may be complete.
Bill