Yearning to redeem us from Mitzrayim, He is waiting to redeem us from whichever galus we are experiencing. We have a mitzvah to emulate Hashem's middos, as the passuk says תכלהו דברכיו. By calling the night of the Seder ליל שימורים, He is showing us that there is an inyan to wait and hope for the geulah to come. Therefore, whichever galus we are in, Hashem yearned for our geulah in the core galus Mitzrayim, which included the yearning for the coming of the final geulah and Moshiach. Therefore, we also are to copy Hashem's middos and ratzon and wish and yearn for our own redemption, which is Hashem's will to do so.
Chazal inform us that this ליל שימורים is a ripe time for the final geulah to occur, as Rabbe Yehoshuah says (Yalkut Shmos 12) ןסינבו ולאגנ ןסינב עתידין ליגאל. Where in the Haggaddah can we find a reference to the fulfillment of צפית לישועה, where a Yid can have a heartfelt yearning for the final geulah?
I once saw in the Haggadah מן המיצר, written by a Yid in Russia whose six different pairushim on the Haggadah were smuggled out over 50 years ago. It is hinted in the words לשנה הבאה בני חורין. He explained if one takes the letters of the word חורין, he will find that each letter ends the name of one of the redeemers of the five exiles. The redeemer of the first galus Mitzrayim is משה רבנו, the letter vov. The redeemer of galus Bavel was עזרא הסופר, the letter raish. The redeemer of גלות פרס was יכדרמ דוהיהי, which ends with the letter yud. The redeemer of the galus of the Greeks was מתתיהו הכהן, the letter nun. So far we had the redeemer that spell ןירו. We are waiting for the end of galus Edom, who our redeemer will be no other than משיח. This is our wish לשנה הבאה בני חורין, not just to be free, but rather have the malchus of Hashem through מלך המשיח, the letter ches which is still missing.
Although today we only have the letters רוני, which is interpreted by some to be in anguish and others to be in simcha, as in the passuk קומי רוני בלילה. It has been a long time of waiting for Mashiach, enough to cry about. At the same time, when one learns Torah at night, he is besimcha because Hashem is opposite him while he is learning. To bring the letter ches of Mashiach, we need both emotions. One to show Hashem that you are in pain because the galus keeps on getting darker, but on the other hand, you are besimcha that you can still learn and have Hashem as your chavrusah. There is no place for despair if one continues to learn Torah, for he can find Hashem in the Torah in which He hides Himself.
