Firstly, i'd say only ditch the 28-135 for the 24-105 if you actually use it.
With the tse24, 50/1.2, and 100L, i'd be set with that lineup, i've got the 15-85 and have to force myself to use it sometimes. (but then, i'm not travelling or doing much landscape shooting, if i were travelling my 'kit zoom' would get much more work than it is).
And as you've got the 70-200 in f/4 and f/2.8 IS II, i'd be keeping only one if i were you. Of course the 2.8 IS II wins in almost every respect, except size and weight (yes, there are people who prefer the f/4 versions). I'd pick the 2.8 though.
And i'd love to put a 200-400 on my 7D, or even on a 1Dmk4. But between that and the 400/2.8 for the same price, I think i'd go the latter with extenders, unless the zoom turns out to be smaller and lighter (who knows? i'm guessing roughly the same size). I'd probably go 5D3 and Zeiss 21mm before this lens though.