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They won't introduce a new type. The only reason new types were introduced way back in Gen 2 was for balance reasons.
Dark type was introduced to neutralise Ghost and Psychic types, which were near unbeatable in Gen I. Steel was an extension of this, introduced as a strong defensive type that resists most types, including Ghost and Psychic.
There are no game breaking advantages in Pokémon as it is, and if it was, they would have introduced a new type or nerfed and fiddled with the existing mechanics long ago. The only need for balance since Gen II has been the physical/special split in Gen IV. As it is, the Pokémon gameplay is, aside from personal gripes with the metagame, perfect. Nothing needs to change. So it won't.
now please.
Shut the fuck up.