Where C exists today and will be replaced by E over D, the entire profile on descent and climb will be in E.
As I understand it the descent profiles present the biggest problems at the primaries. (Speed control/flow sequencing will enter that debate as well I assume).
I think this is a significant issue; into HB, LT and AS initially the descent profile will more than likely take aircraft into G.
Why?
Same steps (miles), different heights...
FL125 replaced by FL145.
FL200 replaced by FL245 are we seeing a problem; oh that's right it's now see and avoid.
Bottle of Rum