Class One. Another Ma’amar that is (in part) a Mattan Torah Ma’amar. Why is Hashem introducing Himself as the Redeemer and not as the Creator, considering that Creator is Yesh MeAyin and a far greater miracle? The Rebbe explains because we look at things when they are actual (revealed) and not potential (hidden). Though from the moment of Creation the possibility of revealing the Ma’ala of Tachtonim was present (Birurim) it could not be done actually until we went through galus and the Geula from Mitzrayim.
Class Two. The Birchas Kohanim half of this Ma’amar discusses the connection between Hashem’s ‘Nesias Punim’ (favoritism) towards Yidden and eating food and Bentching after only a kazayis. The ma’amar explains that until Matan Torah this was all potential (Bracha Rishona) and is actualized after the Birur of Galus (Bracha Achrona).