So I was right, it is a new type. I totally wasn't expecting that 
I guess Light type makes sense, since Umbreon was Dark and the Dark type was generally missing an opposite counterpart. The main problem with introducing a new type is, as I said, it'd be inconsistent with previous gens which could/should have Pokemon with this type. I mean OK, giving a Pokemon an additional type in the second gen (e.g. giving Magnemite Steel) is OK, but this far in there'll either have to be 1) no pre-sixth-gen Pokemon with the Light type or 2) various Pokemon suddenly discovered to be Light type, both of which would grind my gears a bit. But no big deal I guess.
I agree with Koopaul though, I think Sound would be a cool new type. It would be a better type for Audino especially, rather than just Normal.
I guess Light type makes sense, since Umbreon was Dark and the Dark type was generally missing an opposite counterpart. The main problem with introducing a new type is, as I said, it'd be inconsistent with previous gens which could/should have Pokemon with this type. I mean OK, giving a Pokemon an additional type in the second gen (e.g. giving Magnemite Steel) is OK, but this far in there'll either have to be 1) no pre-sixth-gen Pokemon with the Light type or 2) various Pokemon suddenly discovered to be Light type, both of which would grind my gears a bit. But no big deal I guess.
I agree with Koopaul though, I think Sound would be a cool new type. It would be a better type for Audino especially, rather than just Normal.