I can see it being $2499+ (hopefully Canon prepares it's 2.8 trinity of the 14-24, 24-70, 70-200 2.8 IS within the $2-2.5k mark), though I am personally prepared and set aside up to $3k for this lens!
Besides optics, I just hope they don't screw up the lens cap design with the protruding glass front with a cheap plastic cap cover that just comes right off in your bag like on the Canon 8-15mm fisheye, Nikon 14-24mm or like the the slide in caps on the Zeiss 15mm or Canon 14mm II that over time and use will show noticeable wear on the built in lens hood. Hopefully Canon can get it done right like the twist-on cap design on the 17mm ts-e!