1)
This is just like verse 7! Why is this repeated?
1.
Radak: Verses often repeat matters with minor differences.
2.
Radak citing Ibn Ezra: This hints to the return of honor when the redeemer (Mashi'ach) will come (the honor was not in Bayis Sheni).
2)
What should Pischei Olam carry?
1.
Radak citing Ibn Ezra: They should lift their heads. "Rosheichem" applies also to Pischei Olam. Malbim - they should not do so amidst fear of punishment, rather, amidst awe of Hashem's grandeur - He created everything!