Hard or soft graduated ND is what you need for that dynamic range, depending on whether the demarcation is straight (hard grad) or not (soft grad). An ND would be needed if contemplating long exposures.
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The 70-300L is not a slide barrel zoom, it's a rotation zoom.
I'm not sure having a 70-200L and a 70-300L zoom lens is the way to go. If you want to keep your 70-200L, I would personally either get the 100-400L or the 300 f/4L prime lens. If you want the 70-300L zoom, you might consider selling the 70-200L lens.
I wonder if the Canon marketing people will embrace the Apple style of version numbering... I.e. dump it and just have product ranges and call a new one just "the new Canon 1Dx" etc ?