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I'd love a Sound type, to be honest. Jigglypuff and Co. (Normal/Sound) Chatot (Flying/Sound) Chimecho and Co. (Psychic/Sound) Whismur and Co. (Normal/Sound) Tympole and Co. (Water/Psychic (Yeah no Ground :V)
Sound based moves could be moves blocked by Soundproof, and stuff like Howl.
There should be a speed type. They are immune to fighting and dark because of their reflexies. They are also immune to moves that insure that their foe goes first. Like Sucker Punch, Fake Out, Shadow Sneak etc wouldn't be effective against these types. They are also immune to the Trick Room effect and speed lowering status moves. However speed types wouldn't be able to use trick room or double team or and speed raising/lowering moves.
Speed moves can be supereffective against fighting, rock and ground and dark but weak to psychic, ghost and flying.
There's so much types already, so I wouldn't add any, but at the same time I won't remove any types. The amount of types is perfect, so let's just leave it at that. Although it would be cool if they kept ???-type and made Normal-type super effective against it.
I reckon they should add one more type wether it be cosmic, sound, anything (except light), it just makes the game more creative in my opinion, but I don't see any types that are going to be released since the types are balanced enough as it is... As for Normal types, it's already been explained, so I'll give you a short answer... There Awesome! :P