"rumored" canon 14-24 l 2.8 + 24-70 2.8 ii + 70-200 2.8 is ii - this is the pro setup.
Some f4 wide angle (ex. 12-24 f4) + 24-70 f4 is + canon 70-200 f4 is -enthusiast setup
I think the f/2.8 wide angle will be 14-24mm, but I think the f/4 will be 16-35 IS to directly compete in all aspects with the Nikon lens. That will make it wider than the current f/4, sharper (as pretty much all lenses have been over their predecessors) and likely more expensive. Hopefully, Canon will come out with cheaper variable aperture [or non-IS] UWA to replace the long-extinct 20-35mm f/3.5-4.5 USM for the lower end of the budget (~$500), as well. Think about this (as a beginner):
Canon 6D + '24-70mm f/4 IS' = $2600 (same price as Nikon D600 kit)
Canon '18-35mm f/4' or '16-35mm non-IS' = $500
Canon 70-200mm f/4 USM = $630
TOTAL = $3730
Pretty sweet [theoretical] package for <$4000, right? Not that 2 of the three lenses even exist, but it is certainly possible.