I think Infernal City mentioned that Mages Guild no longer exists (and some two other magic factions with non-generic names have emerged from it).
Yup, the http://www.uesp.net/wiki/Lore:Synod and http://www.uesp.net/wiki/Lore:College_of_Whispers
Rival join-able factions would be good, and if possible more ways to restrict faction joining condition (IE a Dark Brotherhood Silencer shouldn't be able to join Blades, that's plain silly in their part)
If you were a known murderer (had a murder bounty before), this should be true, however, it should be possible to join both. By day a noble knight, by night a ruthless murderer.
didn't they also mention it would happen partly in highrock?
maybe that includes orsinium
Uhh... whatchu talkin' about Willis?
Otherwise I would like to see some guilds like
Fighters Guild
Synod
College of Whispers
Bards College
Vampire Hunters
Imperial Legion
A militia of some sort
Nine Divines (priests)
Regional Knights
Dark Brotherhood
Thieve's Guild
Witch Covens
Vampire Covens
An angry anti-government orginisation
A happy pro-government organisation.
I'd also like traces of other guilds like the Bakers Guild, prosttutes Guild, Travellers Guild, etc.