I believe masterpieces were a good example of Brawl just having more filler than useful content. Just wastes of space, really. I don't believe they, along with the chronicle and stickers, should return.
I doubt that the Chronicle and stickers took all that much time to put into the game or took up any noticeable space.
Along with the trophies, the Chronicle and Stickers showcase nintendo's rich history.
Ever since melee, Smash became not only a fighting game, but a museum of nintendo lore.
I won't miss em too much if they're gone but they were a nice addition.
The masterpieces didn't really span enough games to show where characters movesets and such came from, if they are gonna include it, they gotta include at least 1 game for each character that appeared on the N64 or earlier, although I guess I understand that not all of those games have been ported yet. And once the wii u becomes hackable, all of those games will be available for free which puts nintendo in a tough spot.
What I'd really like to see is a gallery showing iconic screenshots from past games maybe explaining where characters got their moves and just looking cool.
Like the image of Link getting the sword from the old man, or Mario jumping to reach the flag.
Or what about videos showing the development process?
(I wonder if nintendo even films that stuff)