Upload & Sell: Off
Well, on the upside, this new 24-70 might drive down the price of the older 24-70 2.8, which is a fantastic lens in it's own right.
I'd be interested in the 35 for around $400-$500, because I could see it being a good alternative to the 35 1.4 if IQ was really good, but I just don't see a whole lot of need for IS in the sub 70mm range.
As for a 24-70 f4, I like the idea, and think it could be really cool, but as stated by others, unless it's in the same price range as the 24-105 (which even adjusted for inflation I think should only be around $1100), I just don't see a lot of success for it.
Bottom line, like I said above, this might drive down the 24-105 price a little more, making it even more desirable for me.