This brief Psalm pictures all nations and peoples praising God.

The Psalm is built on the promises of God to Abraham to bless all nations through him and his descendants (Gen. 12:1-3; 22:18) and the blessing the priests pronounced (Numbers 6:24-26).

The nations are not viewed as hostile like Psalm 2:1 or asking God to judge them like Psalm 59:5, but instead it pictures the nations praising God because of the blessings that His people receive. 

God is praised because He judges the nations with uprightness (4), and guides them (4), and because He blesses HIs people (6). 

Jesus and Psalm 67
Jesus is the ultimate display of the light of God's face shining upon us- II Corinthians 4:6; John 1:1-5.
Jesus is the ultimate fulfillment of the promises of God to Abraham- Acts 3:25; Galatians 3:7-8, 16, 26-29
Through Jesus the nations praise God- Psalm 117:1 is quoted in Romans 15:11 as we see Jews and Gentiles praising God together. Revelation 5:9; 7;9-10.