Predictably, Skaven decks are still pretty easy to build, as you're really only building half of a deck. Pre-Assault, I generally played 25-30 neutrals, then 15+ cards from one faction, and usually only 3-6 splash cards (usually just Lobber Crew or Seduced). This let you play some of the multiple-icon cards like Flames of Tzeentch, Waaagh!, etc. Now, with Dark Elves in the mix, I kind of want to play a little of everything
Dark Elf Capital Board ( I guess this makes it "Wild Berry" Skittles)
Rats (19):
3 Gutter Runners (2)
3 Clan Rats (2)
3 Clan Moulder's Elite (2)
3 Greyseer (3)
2 Globadiers (3)
3 Deathmaster (4)
2 Rat Ogre (4)
Orc Units (6):
3 Spider Riders (1-O)
3 Lobber Crew (2-O)
Dark Elf Units (4):
3 Shades (2-D)
1 Dark Sorceress (4-DD)
Chaos Units (3):
3 Festering Nurglings (2-C)
Support (10):
3 Warpstone Excavation (0)
3 Contested Village (1)
2 Chaos/Orc Banner (2)
2 Altar of Khaine (4-DD)
Tactics (6):
3 Seduced By Darkness (0-C)
3 Chillwind (1-D)
Quests (2):
2 Wolves of the North (0-CC)
This isn't quite as fast as Skaven decks of yore, but's it's still pretty fast. Chillwind makes the Deathmaster even more ridiculous if they can't remove him. Altar of Khaine lets you scoop up anybody they do remove for a barrel. Having access to three more Scouts lets you take over games with them, especially considering you can now play nine corruption effects. Dark Soceress could be another Altar of Khaine, Globadiers, or a Cold One Riders. We Need Your Blood could be good in the "Deathmaster's dance" you get in the mirror, but is going to be more weenie control than you need sometimes (1 HP guys tend not to hang around).
There is a lot of Skaven-hate available now, especially from DE and Chaos, so they may not be the deck to beat, but I still think they are a decent choice. It'll be interesting to see how the meta shakes out.