1)
Why does it say "va'Anachnu" with the prefix Vov?
1.
Malbim: Also, via punishing them, we will forever thank You and sanctify Your name, both via thanking for the good, and telling Your praise.
2)
Why does it say "Nodeh Lecha l'Olam"?
1.
Radak: Both in Galus, and when we leave Galus.
