Notes:

UPDATE: The Japanese Pokémon Youtube channel just came out and officially revealed all seven. To quote Serebii.net:
"Edit @ 11:11: Now confirmed with an official trailer. It confirms that Tapukoko is Electric/Fairy. Charjabug is Bug/Electric. Vikavolt is Bug/Electric. Drampa is Normal/Dragon. Bruxish is Water/Psychic. Cutiefly is Bug/Fairy and Togedemaru is Electric/Steel-type"

–Footage of all seven has gotten around, but don't expect a concrete link due to takedowns. I was able to catch their names, however.– No longer relevant.

- Togedemaru appears to be this generation's new electric rodent.
- Tapu Koko is the unseen Pokémon mentioned in the game footage shown at E3. It is most likely a Legendary Pokémon found on the first island.
- Cutiefly is the small bug. Expect it to take on a more menacing form if this is indeed true.
- Drampa is the dragon-looking creature. It may not evolve based on how early the other Pokémon can likely be encountered.
- Charjabug is the box-like bug, and Vikavolt is the big beetle. They are very likely Grubbin's evolutions based on the official description for that Pokémon and the similarities in design.
- Bruxish is the fish. Perhaps its name and design are meant to give the impression of its body being covered in paint?

Serebii.net has more information. –As always with these things, there has been no OFFICIAL confirmation. I wouldn't say the footage is a 100% confirmation; while the gameplay appears to be relatively clean, the audio feels incomplete with no sound effects and this could be done by messing with the other 3DS Pokémon games.– See above.