Dan, I hope you hurry and give us a setlist and review after the show. Knowing Roger's band's ability to do some abrupt things, I'd say you should expect anything between a speech or a full-fledged cover of a Syd song at the show. Or at least some VERY haunting moments during Shine On, WYWH, StC, and maybe Great Gig and Brain Damage.
I am a fan of Gilmour, more than a fan of Waters, but the concert that I've seen in Lucca (Waters) was much better than the concert that I've seen in Florence (Gilmour)...