Cassette and chain mileage is a whole different topic and quite complicated, since Campy chains don't wear like most other brands and most people have no clue how to measure the wear properly. Riding conditions and maintenance technique all have major affects on chain life.

I once use a Campy 10 chain for 6,000 miles before it was totally shot. I expect less from the new 11 speed chains, but at least 4,000 miles. Some riders will get more if they ride flatter terrain that's not as gritty as the roads I'm on. One person on another site posted an increase in roller spacing of only .015 inch and no mesureable elongation (with a 12" scale) after 2500 miles. Even though he weighs 40 lbs more than I do and we both use the same homebrew lube, he's getting less wear than I'm seeing. I'll trash a Campy chain when the roller spacing increases by about .040 inch, regardless of how small the elongation is. You can't leave a single chain in use for that long without risking new-chain skip, when a new chain is installed. I use a 3-chain rotation and never let a chain become more than half-worn before switching to the next one. I expect no less than 12,000 miles from 3 chains and one cassette. With 10 speed, I'd expect 15,000.

The cog thickness is the same as Shimano 10, so the cogs should last just at long.