Although most of us would probably love to have an extra save file (including me) I highly doubt it happening, especially with the wealth of new online features and trading, as well as Mystery Gifts. With two save files, it can quickly get complicated when it comes to trading and online battling, especially with the Friend Code, plus if you wanted to transfer over from one save file to other it would be confusing and may be a complicated procedure.
I did in a way manage to restart my game without losing any Pokemon on my initial save file by using the Pokemon Bank: I transferred everything from my first save file over to the Bank, then restarted the game, chose a different starter, and brought everything back from the Bank into my new game. It worked, but I lost all my items (including the Mystery Gift Blazekinite, a rarity at the time...)