We have done the FDP at MMs a few times now. There is not a special menu, so to speak, but they have certain things that you get.
You start off with the bread and dipping sauces, which are great.

Then you get a very large(family style) mixed green salad. We werent thrilled with this and the last time we went, we asked to subsitute a Caesar salad, which they let us do. Then you get your choice of any flatbread on the menu, 1 for every 4 people in your party. We had 5 in our party so we got 2. Each person gets a choice of any entree on the menu, and any dessert on the menu. We had been told before that we only had a choice of cheesecake or tiramisu, but the last time, we were told any dessert.
As for what time to get there, the policy is to get to the entrance near Oscars, 1/2 hour before show time. After our experience last time, I would get there earlier. We got there right before 1/2 hour early and started our walk up the path. By the time we got close to the stadium, they were letting the regular line merge in with the FDP line, and we saw plenty of people from that line getting seats in the reserved section. We got one of the last rows in the reserved section, with the handicap accesible rows behind us. People who had done the FDP were seated in those rows and were repeatedly yelled at to move. They didnt and were yeling back because they did the package and saw others who hadnt, taking their seats. These people probably arrived at the entrance 1/2 hour early like they were supposed to, but it takes about 5 minutes to walk to the stadium from there. I dont know if this was a rare occurance that they merged the lines too early that night or what, but I would be cautious about making it just in time again. Ill admit I would have been very upset if I had done the package, arrived when I was told to, and then ended up in the standing section anyway.