MrdeathkillsYa, I wonder if they are random or just the ones pictured... How do we know which guilds we will receive? How do we know we won't get duplicates? How do we decide on our guilds if we get the option? Questions People, Questions!
JdvanliewHere's the Wizard's page that explains the guild packs a bit more
http://archive.wizards.com/Magic/magazine/article.aspx?x=mtg/daily/arcana/1156
(adding the link in my comments doesn't seem to work, sorry, but you can find it by googling)
In short, each pack has the Front guild that you know about, then randomly has one of four possible guilds as a "secret ally" (the two guilds will share 1 color).
The way this drop works, you're guaranteed one of each of the RTR guilds. Each one of them has a random GTC guild
So your five prerelease kits will be:
Azorius + Boros OR Dimir OR Orzov OR Simic
Izzet + Boros OR Dimir OR Gruul OR Simic
Golgari + Dimir OR Gruul OR Orzov OR Simic
Rakdos + Boros OR Dimir OR Gruul OR Orzov
Selesnya + Boros OR Gruul OR Orzov OR Simic
This means you will have all of the RTR guilds, but unless you get really lucky, you are going to get duplicate GTC guilds. Also, there's no way I see to request particular GTC guilds.
In short, each pack has the Front guild that you know about, then randomly has one of four possible guilds as a "secret ally" (the two guilds will share 1 color).
The way this drop works, you're guaranteed one of each of the RTR guilds. Each one of them has a random GTC guild So your five prerelease kits will be: Azorius + Boros OR Dimir OR Orzov OR Simic Izzet + Boros OR Dimir OR Gruul OR Simic Golgari + Dimir OR Gruul OR Orzov OR Simic Rakdos + Boros OR Dimir OR Gruul OR Orzov Selesnya + Boros OR Gruul OR Orzov OR Simic
This means you will have all of the RTR guilds, but unless you get really lucky, you are going to get duplicate GTC guilds. Also, there's no way I see to request particular GTC guilds.