I agree on everything but the propo steering. I've raced cars on tracks since about the begining. The problem zips and bits have is that if you start using the larger rpm motors the cars will either flip or take a turn too sharp and send ya into a wall. This is where propo steering will be a god sent. I'm hoping for a throttle too, I'm crossing my fingers. It's also been reported that the 2.0s will be fully modable and cross compatible with the original zips. If I have to pay an extra $10 to get a new zip with a stock spring suspension and any type of propo, I will gladly pay it. Also we can assume that the cars will come with stock dual bats (they had better) if only for the reason that the propo steering will be taking up more juice than the magnet coils.
We'll just have to wait and see.
You could also read some of the puchi maru threads to evalute the effects of propo steering on matchbox size cars.