Tokina was successful for selling some unusual wide angle zooms for which there is not much competition.
Competing for 24-70/2.8 will be much harder.
I'd be interested in something more like 24-85/3.5 or 28-85/2.8
http://flickr.com/ephankim
Me too, youpii.
35-105/3.5 or 35-85/2.8 would also be interesting (and maybe easier to design?).
I see Tokina creating a f2.8 line of lenses: 16-28, 24-70,... Tamron does the same. I hope they come up f4 line.