Kaladesh is fully spoiled! You can see it here: Kaladesh Full Spoiler!
These are some of my favorite new cards: Harsh Scrutiny is a strictly better Ostracize. It could see some Standard play if there’s a major, viable creature based combo. Take Down seems like a good card against aggressive thopter decks. Fateful Showdown is a Wheel of Fortune that can also burn a creature. Mizzix decks would like this card, since they draw a lot of cards and want burn.