There are too many performances to go into detail here, but they include excerpts from Rossini, Mozart, Bach, Beethoven, & Handel/Händel, as well as some jazz and ballet. You should be able to work it out by looking at the programme even though it's in German.
A lot of the Staatsoper's stars are taking part, so I expect it to be good. The performances vary in length, so if it's not the sort of thing you'd usually go to it's easy to pop by for a short time, while on your way somewhere else.
Here's a map of the various locations, taken from the programme (the numbers indicate where performances are taking place).
