“listen.” The Greek word is idou (#2400 ἰδού), and it is used to get our attention. See commentary on Matthew 1:20.

“the people.” Often the Greek word laos (#2992 λαός) is used to designate specifically the Jewish people. This is the case here; laos is to be understood to mean the people of Israel.^a If God had wanted to refer to the Gentiles and everyone he could have used the plural, “the peoples” (e.g. Luke 2:31; Rom. 15:11), or “all nations” (panta ta ethne: Matt. 28:19). For scriptures where “the people” clearly refers to the Jews, see: Matthew 13:15; Mark 7:6; Luke 1:68; 2:10; John 11:50; 18:14; Acts 3:23; 7:17; 13:17; 13:24; 13:31; 21:28; Hebrews 7:11; 7:27; 9:7; 9:19; 11:25.

Here in Luke 2:10, by extension this announcement is good news to all people everywhere (Luke 2:31-32), and the future “will be” is prophetic to this effect, but here the angel is speaking to the shepherds in a way they would understand, of Israel’s long-awaited Messiah (cp. Luke 1:68).