Actually, there was an article on the website that descibed all the guilds, it's here.
dhttp://www.wizards.com/default.asp?x=mtgcom/feature/283
Also, we can be generally sure blue/white will be in Guildpact, since the you-make-the-card thing is finished and it was blue/white.
1:what will be the style of the 4 guilds in the next set in the block(maybe mixing abilities of the guilds already in play;ie:dredge and transmuting)
actually, there will only be three combinations in the next two sets
And finally,
I can't wait for black/white and black/red!
same here, but the one I'm looking forward to the most is white/black since that's the coolest color combination whatsoever. I'm pretty sure the basic themes with the Orzhov will the the ones from the
onslaught clerics [life gain, life stealing and sacrificing, (think Cabal archon)]. My only problem is that if you read the article from above it says the orzhov are really about greed, which in my opinion is a lot less cool then the black/white from onslaught (like from Vile deacon)