I'd definitely expect things to get firmed up much closer to time - you're over a year away. I'm doing a Med/Venice cruise in July and they're still firming up some of those - I'd already signed up for one at Livorno (Florence) that they ended up NOT doing, so they put me on the other one to the same general area and refunded the difference (I'm deciding if I want to keep it as I'm not thrilled with "time at a local shopping mall" - I mean, REALLY? When I go to Italy the last place I want to go is a stupid mall - BUT I've already been to Florence for a week, so the tours to the city don't interest me. I would love to go to Volterra, which one tour does, but we're there on a Sunday when the town is pretty much closed, UGH! So right now my choices are the Coastal Cirque Terre including the mall, a beach day (I love the beach, but...) including Pisa which I've already done, or staying on the ship. Unless they add something else in. And no, a private tour is not an option as the only ones I'm finding are absurdly expensive for one (if they even offer it for one), and to me sharing negates the DIY aspect of a private tour as one would clearly be outvoted by the majority in a share.)
You can get an idea of what might be offered by looking at excursions for a similar itinerary to see what you might be interested in.