The Witcher 2 Epilogue

There're no actual quests in the Epilogue (besides the main "The Assassins of Kings" quest) and the main decision that you have to make is either kill Letho of Gulet, the kingslayer, or not.

=The Plot behind the assassinations= In the end when you finally meet Letho he explains to you that he fulfilled the plan developed by Emhyr var Emreis to "soften" the North before the upcoming invasion.

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= Letho's Fate = You can either kill Letho or let him live. You don't gain anything by killing him, though thus you can have "the final battle" which is compulsory for many games.

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It you spare him than as the journal says his fate is "story for another time".

= Endings =

Geralt and Triss (Roche's Path)
If Geralt chosed to save Triss then after defeating the dragon she meets him on the wall and tells that Letho is waiting at the main square. Later they meet Roche who is declared criminal in Nothern kingdoms. He is not pleased that Geralt didn't help him to save Anais and Dethmold could escape.

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