Courtesy of Flame Dragon
At the MTG panal at comic con we some more info about the set and block.
1)
First, guilds are back. RTR has:
Azorius
Rakdos
Selesnya
Izzet
Golgari
The second set, Gatecrash, is a second large set and has:
Orzhov
Boros
Simic (guild leader is a Merfolk, so yes, the folk are in the block too)
Dimir
Gruul
The third set will than have all 10 guilds and will be a small set.
2)
The draft format will go
Fall: RTR, RTR, RTR
Winter: Gate, Gate, Gate
Spring: 3rd set, RTR, Gate (If memory serves)
3)
Each guild will have its own keyword
4)
At the prerelease you pick a guild and that determins
-The 6th pack you get
-The spindown dice you get
-The prerelease promo you get
Also, that promo IS playable at the event.
The only problem with wanting October to get here faster is that school starts up again. But still, that seems like a fair trade.