1)
Who is the Evyon (destitute) who will not be forgotten?
1.
Rashi: It is Yisrael. Hashem will punish those who subjugated them. Malbim - this explains verse 18; this is why "Kol Goyim Shechechei Elokim" will go to Gehinom.
2.
Radak: If Yisrael are afflicted via Pelishtim, this will not last long.
2)
Will the hope of the poor be lost?
1.
Radak, Malbim: No. "Lo" written above refers to also to this. We find like this in many verses. Malbim - their hope is that Hashem's kingship and dominance be revealed, to destroy all who forget His name and deny Him.
3)
Why is "Aniyim" written with a Vov?
1.
Radak: It is written like Anavim; the poor are usually humble.