EA, a Coptic person I know recently told me that the COC is planning or wants to put the vows (a western idea) in the Coptic wedding ceremony.
I've never heard anything to that effect. Official sources would be nice. The Liturgy itself is replete with references to the husband's obligation to his wife and vice versa. The Church thus essentially makes their vows for them.
In any event, in my local parish the priest has advocated the use of written vows (which are merely signed; they're not recited audibly during the Liturgy or anything like that). I know this because i'm in fact the one who is assigned with the task of printing them. Here is a copy of the husband's vow to his wife:
"HANY, love your wife MARY-THERESE, just as Christ also loved the church and gave Himself for her, that He might sanctify and cleanse her with the washing of water by the word, that He might present her to Himself a glorious church, not having spot or wrinkle or any such thing, but that she should be holy and without blemish. So HANY, you ought to love MARY-THERESE your own wife as your own body; he who loves his wife loves himself. For no one ever hated his own flesh, but nourishes and cherishes it just as the Lord does the church.
Dear blessed son HANY, may the grace of the Holy Spirit strengthen you to take unto yourself your wife MARY-THERESE, in purity of heart and in sincerity. HANY, do all that is good for MARY-THERESE. Have compassion on her and always hasten to do what gladdens MARY-THERESE’S heart. Take care of MARY-THERESE, as from now on you are responsible for her after her parents; you have been crowned with heavenly crowns and confirmed by the grace of God.
Remember HANY that if you fulfill the divine commandments, the Lord will bless you in all you do. He will grant you, HANY, blessed children and a long peaceful life: He will bless you in this life and in the hereafter."I've been to Greek and Coptic weddings where the procession down the aisle was with the traditional organ tune "Here comes..."  rather than a chant by chanters or clergy but never with vows.
No way...that's a disgrace. I could never imagine
Epouro (the traditional Coptic hymn customarily chanted during the procession) being replaced by anything else. It is chanted there for a reason, and it's such a beautiful joyful hymn anyway (one of my favourite in fact).