Less preliminary program.
Prerequisites:
a) Algebraic geometry: Chapters 2 and 3 of Hartshonre should be sufficient.
b) Homological algebra: we are going to assume a reasonable knowledge of derived and triangulated category. Chapter 1 of Kashiwara-Shapira should be sufficient.
c) Lie algebras and algebraic groups. This is going to be reminded but a prior familiarity with the basics of the subject will be very useful.