Man, oh man...to those entertaining the idea of Judas being redeemed...boy, would I love to see the look on your faces during attendance at a Coptic Orthodox Church for the Holy Thursday and Friday Eve Pascha Week services.
From the 'Homily of Our Holy Father Saint John Chrysostom' read after the Blessing of the Waters on Holy Thursday: "My beloved, on this day our Lord Christ was betrayed; if you then hear about His betrayal, do not be disappointed. Let me tell you about whom you should be disappointed. Lament and cry over he who gave Him up; I mean Judas. For He who was betrayed sits at the right hand of the Father in heaven, and reigns over all, an everlasting reign. As for he who gave Him up, he has descended into the depths of Hades, and there shall he remain unto the end in anticipation of great grief and lament."
From the exposition of the Sixth Hour Gospel of Friday Eve: "....On the third occasion [Christ] came to His disciples and said: 'Are you sleeping? Behold the hour is at hand and the Son of Man is being betrayed into the hands of sinners. Rise, let us be going. Behold, my betrayer is at hand. Woe to you Judas, more than anyone else, for your sins have multiplied. You rejected Grace and loved damnation; it will be with you unto the age of ages.'"
From the exposition of the Ninth Hour Gospel of Friday Eve: "Woe to you Judas, for you...anathematized yourself, and so your share will be with the corrupt o wicked one."
We've got similar themes going on in our hymns:
From the Orthros of Holy Wed (chanted Holy Tues night, and repeated during the Wed Presanctified Liturgy):
"The harlot came to You, O Merciful Lord, pouring out on Your feet Myrrh, mixed with her tears, and was redeemed of her vices at Your command; but Your ungrateful Disciple, though he breathed Your grace, rejected it, and becoming mixed in he filthy mire4, he sells You in his greed. O Christ, glory to Your Compassion."
From the same service, later on:
"O misery of Judas! He saw the harlot kissing the feet, and with guile he meditated the kiss of betrayal. She unloosed her tresses, and he bound himself with fur, bringing instead of myrrh, his foul wickedness; for envy knows not to appreciate even its own advantage. O wretchedness of Judas! From this, O God, deliver our souls."
We've got a few others that are more forceful in their language on other days.
Of course, if Judas had repented, Christ would have forgiven him - He had already forgiven those who has delivered Him up while He was on the Cross (asking the Father to forgive them in their ignorance). He certainly did not repent while alive, and I'm unwilling to speculate as to his activity once dead.