If the rumors hold, next week is going to be a good week for announcements. In addition to the 5DIV, we will be looking at an EF 16-35 f/2.8 III and a EF 24-105 f/4 IS II.
Personally, I am pretty set on lenses for awhile. But I am happy to hear about these two. Hopefully they are inline with all the other recent zoom lenses (11-22, 16-35 f/4 IS, 24-70 II, etc) that have been announced with top notch construction and IQ. I will say, again if the rumor holds, this also continues the trend of bigger heavier zoom lenses.
But, I expect these to be great and I imagine they will find their way into many photographers kits, just not mine unless I decide to shake something up next winter.