DAMN those are some weird-ass types imo. they look nothing like that at all!!!
If I showed you a picture of Torchic before it came out and told you it would evolve into a Fire and Fighting Pokemon, you'd laugh at me. They don't need to look like those types because (I assume) only their evolved forms are going to gain those types. I think if they do go with Dark/Psychic/Fighting, they would go with Grass/Dark, Fire/Psychic, and Water/Fighting since I can see a snake being Dark more easily than one that's Fighting.
Predictions for Zoroark and Illusion:
Works exaxtly like Transform and activates when it switches in:
It will have a tough time competetively, unless it gets massive HP or comes in on something like a sleeping DD Gyarados.
Makes Zoroark appear to be another Pokemon:
It would be gimmicky, but it could allow you to play mind games with your opponent, especially if you make it look like a Ghost Pokemon.
Lets you choose which Pokemon Zoroark turns into when you get it and it stays that way forever:
I'm not really sure how they could impliment this, but it would completely destroy Species Clause, since you could just have Zoroark transform into anything and (most likely) still have it count as Zoroark.
Edit: I don't think we'll know exactly how Trickery works until we can get the ROM but I think it could work by using your opponents Atk/SpAtk to hit them. Claw Sharpen seems like it won't be too useful outside of the Battle Tower, since everything that gets it will most likely get Swords Dance and any attack that would be made 100% accurate by it, already has decent accuracy.