@ Sneakmaster
I am with you mate. I thought there wont be an end of the game, but now I am disappointed.

When I play an RPGame, I rarely roll many characters. I play only one, because I try to role play him as my self. I don't do couple of plays, being good, bad and neutral. In such games I rush to do the main story quest and then continue with side quests and special item collecting. When there is no free play after the end, I just play to the final mission and then quit the game. I am not fancy on "OMG this is the final, now I better reload my last save and do all the quests I can and get all the special items" It just breaks the immersion, because I know that I am actually to the end of the game. Another thing for me is when the freeplay hits, its time for mods, do as you wish, without messing the main story.
Well it is good that I saw this thread, I was planning to preorder the game this week, but I better wait and read the first player reviews about the game length and replayability factor. If it's something like Mafia 2, one can finish it for 10+ hours and then wait for DLC to enhance the gaming experience, no thanks, I will pass.