Y'know, I feel like that Pokémon X and Y won't be introducing new types of stats, since this is something that they have never done since the days of Gold/Silver where they split Special into Special Attack and Special Defense. But you never know, they could.
If there was any new stats categories... I would speculate Friendship stats... since there's nothing else I can think off. But introducing new stats is highly unlikely, since there's hardly anything I can think of regarding new stats other than "Friendship".