The second cup of wine symbolizes the second expression of redemption: " vehitzalti"--  "I will save you from their bondage" (Exodus 6:6-8). While the first cup symbolized that the Jews would no longer suffer Pharaoh's harsh decrees, this expression promises that the Jews will no longer have to be slaves to Pharaoh; G-d will take us out of Egypt. 


haggadah Section: -- Cup #2 & Dayenu
Source: ArtScroll Chumash: The Stone Edition