The "spells not scaling" bit worries me a bit. I DO NOT want to see fireball I to IX, each doing different amount of damage. That's one innovation of online games and other RPGs that I'd like to leave out of D&D, thank you very much. That said, there's plenty of ways to not scale a fireball and still not use that absurd little convention.
I'm thinking that the new wizard slots are going to be drastically different than what we're talking about here. I'm assuming that what they mean by "siloing" is that they're going to use the pact magic model from Tome of Magic.
Sure, the spells are going to be levels 1-30, but the wizard won't have spell slots for each level. Instead, he'll have a number of "silo slots," just like a binder, the ToM pact mage. in his case, the correct term for the silos is vestiges. The binder starts with one vestige employable, and scale to only four by 20th level. Each vestige grants you three to five abilities, their power scaling with the level of the vestige.
The wizard, I'm betting, will have very few prepared slots, making creating an NPC wizard much easier. Each slot will grant you at will, per encounter and per day spells to cast. Slots will scale, hopefully, so that you'll have lesser flame, flame, and greater flame spell themes, but you won't have Flame I to XXX.
The item affinities will then be pretty easy- the staff grants all elemental affinities +1CL, or something along those lines. More powerful staves will grant you more uses of the per day spell, add more CL, or whatever.
Anyway, that's my guess.