Teasers from Theros

• A 3/3 with three abilities that uses fate counters
• Multiple cards with the word "nongorgon"
• A high-profile cycle of legendary permanents that are not creatures or lands
• A rare card with five words of rules text in which one of the words is "planeswalker"
• An artifact creature that appears to be a big horse made out of wood
• A 5/5 giant snake that can be cast for 
• A multicolor Minotaur lord
• A card that could have been in Modern Masters
• A giant that brings fire to humans
• A creature with a saboteur ability (it has an effect if the creature deals combat damage to an opponent) which is one of the Power Nine

Here are a few names of cards you will see:

• Anger of the Gods
• Chained to the Rocks
• Lost in a Labyrinth
• Rescue from the Underworld
• Underworld Cereberus
• Witch's Eye

Finally, here are some of the creatures you're going to see (note that not all of these are creature types and is only a partial list):

• Catoblepas
• Chimera
• Cyclops
• Harpy
• Hippocamp
• Hundred-Handed One
• Kraken
• Nymph (Alseid, Dryad, Lampad, Naiad, and Oread)
• Pegasus
• Satyr
• Siren
• Triton