Personally i have mixed feelings about the epilogue and i can't decide whether i like it or not but i think that since they are definately putting in an epilogue it should go somewhere in the credits or after the credits that way those fans who hated the way JK can skip it and those who want to watch it can wait, that way everyone would be happy.
Also i really hope they don't put in the line "I've had enough trouble for a lifetime" thats just before the epilogue, i think its alright in the book but i can imagine when its said on screen its going to be one of those cheesey cringeworthy lines (like "Its not hogwarts without you Hagrid") that are ok on paper but when transfered to the screen are just not right.