Also previewed were several pieces of art from Gatecrash, thanks to the wonderful team from tcgplayer they got some good screens from the presentation and also have just posted these pics. Also revealed were the mechanics about the pre-release and the guild packs:
Dragon's Maze will feature all ten guilds from Ravnica. In the prerelease sealed format, players choose their guild and receive a guild pack of the appropriate guild, but it can also support a second guild. Each player attending the prerelease receives the same promotional card, which can not be played in the sealed deck (as opposed to the prerelases to Return to Ravnica and Gatecrash). The draft format for Dragon's Maze also reverts to the normal format of drafting the three sets in a block in reverse order of their release, in this case Dragon's Maze - Gatecrash - Return to Ravnica. Booster packs for Dragon's Maze do not contain basic lands. Instead each booster contains either a Guild Gate, a Shock land, or the mythic rare land Maze's End in the appropriate ratio of their rarities. The Shock lands have the appropriate expansion symbols of Return to Ravnica and Gatecrash, but the Gates are part of Dragon's Maze and have a Dragon's Maze expansion symbol making them part of the set and thus marking the first time cards other than Basic lands are printed multiple times within the same block.
Also shown were the 10 Guild Champions, again thanks tcgplayer! Given a look at the promo for the pre-release which was Maze's End, and also revealed upon completing the maze each player gets a foil plains.
And lets not forget they finally revealed the next block names, codenamed "Friends", "Romans", and "Countrymen", are now Theros, Born of the Gods, and Journey to Nyx respectively. A god based set, which harkens back to Eldrazi? If I remember some of the old original concepts for MtG included some mythology but I could be wrong. Theros, will be 249 cards so a large set, based on the set naming, I think we will see a large/small/large block. Will we see the return of Titans?